diff --git a/CHANGES b/CHANGES
index 4115bc731..a7815f8e2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3,6 +3,7 @@ CHANGES IN FLTK 1.1.8
 	- Documentation fixes (STR #1454, STR #1455, STR #1456,
 	  STR #1457, STR #1458, STR #1460, STR #1481, STR #1578,
 	  STR #1639, STR #1645, STR #1644, STR #1792, STR #1793)
+	- Fixed fl_filename_isdir for "/"-path (STR #1761)
 	- Fixed Fl_Chart drawing (STR #1756)
 	- Fixed mapping of subwindows with unmapped parent
 	  windows (STR #1706)
diff --git a/src/filename_isdir.cxx b/src/filename_isdir.cxx
index 5d58911d8..a8751673d 100644
--- a/src/filename_isdir.cxx
+++ b/src/filename_isdir.cxx
@@ -75,7 +75,7 @@ int fl_filename_isdir(const char* n) {
   // Matt: Just in case, we strip the slash for other operating
   // systems as well, avoid bugs by sloppy implementations
   // of "stat".
-  if (length > 0 && isdirsep(n[length - 1])) {
+  if (length > 1 && isdirsep(n[length - 1])) {
     length --;
     memcpy(fn, n, length);
     fn[length] = '\0';