diff --git a/libs/libc/libc.h b/libs/libc/libc.h
index 178fa44737a..ba339d48d56 100644
--- a/libs/libc/libc.h
+++ b/libs/libc/libc.h
@@ -211,8 +211,8 @@ FAR char *lib_fgets_unlocked(FAR char *buf, size_t buflen, FILE *stream,
 
 /* Defined in lib_libfflush.c */
 
-ssize_t lib_fflush(FAR FILE *stream, bool bforce);
-ssize_t lib_fflush_unlocked(FAR FILE *stream, bool bforce);
+ssize_t lib_fflush(FAR FILE *stream);
+ssize_t lib_fflush_unlocked(FAR FILE *stream);
 
 /* Defined in lib_rdflush_unlocked.c */
 
diff --git a/libs/libc/stdio/lib_fclose.c b/libs/libc/stdio/lib_fclose.c
index 357f7f9f93f..174238c45f6 100644
--- a/libs/libc/stdio/lib_fclose.c
+++ b/libs/libc/stdio/lib_fclose.c
@@ -75,7 +75,7 @@ int fclose(FAR FILE *stream)
 
       if ((stream->fs_oflags & O_WROK) != 0)
         {
-          ret = lib_fflush(stream, true);
+          ret = lib_fflush(stream);
           errcode = get_errno();
         }
 
diff --git a/libs/libc/stdio/lib_fflush.c b/libs/libc/stdio/lib_fflush.c
index 532b327264f..cbe4e7a6026 100644
--- a/libs/libc/stdio/lib_fflush.c
+++ b/libs/libc/stdio/lib_fflush.c
@@ -66,7 +66,7 @@ int fflush(FAR FILE *stream)
     }
   else
     {
-      ret = lib_fflush(stream, true);
+      ret = lib_fflush(stream);
     }
 
   /* Check the return value */
diff --git a/libs/libc/stdio/lib_fputc.c b/libs/libc/stdio/lib_fputc.c
index 132468e0510..ac7c06f8ee2 100644
--- a/libs/libc/stdio/lib_fputc.c
+++ b/libs/libc/stdio/lib_fputc.c
@@ -45,7 +45,7 @@ int fputc_unlocked(int c, FAR FILE *stream)
 
       if (c == '\n' && (stream->fs_flags & __FS_FLAG_LBF) != 0)
         {
-          ret = lib_fflush_unlocked(stream, true);
+          ret = lib_fflush_unlocked(stream);
           if (ret < 0)
             {
               return EOF;
diff --git a/libs/libc/stdio/lib_fputs.c b/libs/libc/stdio/lib_fputs.c
index 60b67931537..4ae8b50538c 100644
--- a/libs/libc/stdio/lib_fputs.c
+++ b/libs/libc/stdio/lib_fputs.c
@@ -67,7 +67,7 @@ int fputs_unlocked(FAR const IPTR char *s, FAR FILE *stream)
 
       if (ch == '\n' && (stream->fs_flags & __FS_FLAG_LBF) != 0)
         {
-          ret = lib_fflush_unlocked(stream, true);
+          ret = lib_fflush_unlocked(stream);
           if (ret < 0)
             {
               return EOF;
@@ -107,7 +107,7 @@ int fputs_unlocked(FAR const IPTR char *s, FAR FILE *stream)
 
           if (*s == '\n')
             {
-              ret = lib_fflush_unlocked(stream, true);
+              ret = lib_fflush_unlocked(stream);
               if (ret < 0)
                 {
                   return EOF;
diff --git a/libs/libc/stdio/lib_freopen.c b/libs/libc/stdio/lib_freopen.c
index 7ca87f4c8a9..b9b52dbd3e6 100644
--- a/libs/libc/stdio/lib_freopen.c
+++ b/libs/libc/stdio/lib_freopen.c
@@ -106,7 +106,7 @@ FAR FILE *freopen(FAR const char *path, FAR const char *mode,
 
       /* Flush the stream and invalidate the read buffer. */
 
-      lib_fflush_unlocked(stream, true);
+      lib_fflush_unlocked(stream);
 
 #ifndef CONFIG_STDIO_DISABLE_BUFFERING
       lib_rdflush_unlocked(stream);
diff --git a/libs/libc/stdio/lib_libfflush.c b/libs/libc/stdio/lib_libfflush.c
index 94a8c37a661..2e268a0200a 100644
--- a/libs/libc/stdio/lib_libfflush.c
+++ b/libs/libc/stdio/lib_libfflush.c
@@ -48,7 +48,6 @@
  *
  * Input Parameters:
  *  stream - the stream to flush
- *  bforce - flush must be complete.
  *
  * Returned Value:
  *  A negated errno value on failure, otherwise the number of bytes remaining
@@ -56,7 +55,7 @@
  *
  ****************************************************************************/
 
-ssize_t lib_fflush_unlocked(FAR FILE *stream, bool bforce)
+ssize_t lib_fflush_unlocked(FAR FILE *stream)
 {
 #ifndef CONFIG_STDIO_DISABLE_BUFFERING
   FAR const char *src;
@@ -137,7 +136,7 @@ ssize_t lib_fflush_unlocked(FAR FILE *stream, bool bforce)
           src     += bytes_written;
           nbuffer -= bytes_written;
         }
-      while (bforce && nbuffer > 0);
+      while (nbuffer > 0);
 
       /* Reset the buffer position to the beginning of the buffer */
 
@@ -168,14 +167,14 @@ ssize_t lib_fflush_unlocked(FAR FILE *stream, bool bforce)
 #endif
 }
 
-ssize_t lib_fflush(FAR FILE *stream, bool bforce)
+ssize_t lib_fflush(FAR FILE *stream)
 {
   ssize_t ret;
 
   /* Make sure that we have exclusive access to the stream */
 
   flockfile(stream);
-  ret = lib_fflush_unlocked(stream, bforce);
+  ret = lib_fflush_unlocked(stream);
   funlockfile(stream);
   return ret;
 }
diff --git a/libs/libc/stdio/lib_libflushall.c b/libs/libc/stdio/lib_libflushall.c
index 11bda4577de..225482cb3ce 100644
--- a/libs/libc/stdio/lib_libflushall.c
+++ b/libs/libc/stdio/lib_libflushall.c
@@ -63,7 +63,7 @@ int lib_flushall(FAR struct streamlist *list)
 
       for (i = 0; i < 3; i++)
         {
-          lib_fflush(&list->sl_std[i], true);
+          lib_fflush(&list->sl_std[i]);
         }
 
       stream = list->sl_head;
@@ -77,7 +77,7 @@ int lib_flushall(FAR struct streamlist *list)
             {
               /* Flush the writable FILE */
 
-              ret = lib_fflush(stream, true);
+              ret = lib_fflush(stream);
               if (ret < 0)
                 {
                   /* An error occurred during the flush AND/OR we were unable
diff --git a/libs/libc/stdio/lib_libfwrite.c b/libs/libc/stdio/lib_libfwrite.c
index f5730c4dbea..6e00bb53625 100644
--- a/libs/libc/stdio/lib_libfwrite.c
+++ b/libs/libc/stdio/lib_libfwrite.c
@@ -130,7 +130,7 @@ ssize_t lib_fwrite_unlocked(FAR const void *ptr, size_t count,
         {
           /* Flush the buffered data to the IO stream */
 
-          int bytes_buffered = lib_fflush_unlocked(stream, true);
+          int bytes_buffered = lib_fflush_unlocked(stream);
           if (bytes_buffered < 0)
             {
               goto errout;
diff --git a/libs/libc/stdio/lib_puts.c b/libs/libc/stdio/lib_puts.c
index dfca0942924..f6d45fc458e 100644
--- a/libs/libc/stdio/lib_puts.c
+++ b/libs/libc/stdio/lib_puts.c
@@ -71,7 +71,7 @@ int puts(FAR const IPTR char *s)
 
           if ((stream->fs_flags & __FS_FLAG_LBF) != 0)
             {
-              ret = lib_fflush_unlocked(stream, true);
+              ret = lib_fflush_unlocked(stream);
               if (ret < 0)
                 {
                   nput = EOF;
diff --git a/libs/libc/stdio/lib_wrflush_unlocked.c b/libs/libc/stdio/lib_wrflush_unlocked.c
index 7bb9e699ff1..0280ac7959c 100644
--- a/libs/libc/stdio/lib_wrflush_unlocked.c
+++ b/libs/libc/stdio/lib_wrflush_unlocked.c
@@ -82,7 +82,7 @@ int lib_wrflush_unlocked(FAR FILE *stream)
    * buffered write data was successfully flushed by lib_fflush().
    */
 
-  return lib_fflush_unlocked(stream, true);
+  return lib_fflush_unlocked(stream);
 
 #else
   /* Verify that we were passed a valid (i.e., non-NULL) stream */
diff --git a/libs/libc/stream/lib_stdoutstream.c b/libs/libc/stream/lib_stdoutstream.c
index e168d8e358b..8e168ffa55d 100644
--- a/libs/libc/stream/lib_stdoutstream.c
+++ b/libs/libc/stream/lib_stdoutstream.c
@@ -113,7 +113,7 @@ static int stdoutstream_flush(FAR struct lib_outstream_s *self)
                                 (FAR struct lib_stdoutstream_s *)self;
 
   DEBUGASSERT(stream != NULL && stream->handle != NULL);
-  return lib_fflush(stream->handle, true);
+  return lib_fflush(stream->handle);
 }
 #endif
 
diff --git a/libs/libc/stream/lib_stdsostream.c b/libs/libc/stream/lib_stdsostream.c
index 87dbbd1e7ad..02886d68614 100644
--- a/libs/libc/stream/lib_stdsostream.c
+++ b/libs/libc/stream/lib_stdsostream.c
@@ -112,7 +112,7 @@ static int stdsostream_flush(FAR struct lib_sostream_s *self)
                                         (FAR struct lib_stdsostream_s *)self;
 
   DEBUGASSERT(stream != NULL && stream->handle != NULL);
-  return lib_fflush(stream->handle, true);
+  return lib_fflush(stream->handle);
 }
 #endif