diff --git a/arch/arm/src/stm32l4/stm32l4_can.c b/arch/arm/src/stm32l4/stm32l4_can.c
index 2d65032c330..a6c40af4e00 100644
--- a/arch/arm/src/stm32l4/stm32l4_can.c
+++ b/arch/arm/src/stm32l4/stm32l4_can.c
@@ -130,10 +130,12 @@ static void stm32l4can_dumpfiltregs(FAR struct stm32l4_can_s *priv,
 
 /* Filtering (todo) */
 
+#ifdef CONFIG_CAN_EXTID
 static int  stm32l4can_addextfilter(FAR struct stm32l4_can_s *priv,
               FAR struct canioc_extfilter_s *arg);
 static int  stm32l4can_delextfilter(FAR struct stm32l4_can_s *priv,
               int arg);
+#endif
 static int  stm32l4can_addstdfilter(FAR struct stm32l4_can_s *priv,
               FAR struct canioc_stdfilter_s *arg);
 static int  stm32l4can_delstdfilter(FAR struct stm32l4_can_s *priv,
@@ -1928,11 +1930,13 @@ static int stm32l4can_filterinit(FAR struct stm32l4_can_s *priv)
  *
  ****************************************************************************/
 
-static int  stm32l4can_addextfilter(FAR struct stm32l4_can_s *priv,
-                                    FAR struct canioc_extfilter_s *arg)
+#ifdef CONFIG_CAN_EXTID
+static int stm32l4can_addextfilter(FAR struct stm32l4_can_s *priv,
+                                   FAR struct canioc_extfilter_s *arg)
 {
   return -ENOTTY;
 }
+#endif
 
 /****************************************************************************
  * Name: stm32l4can_delextfilter
@@ -1952,13 +1956,15 @@ static int  stm32l4can_addextfilter(FAR struct stm32l4_can_s *priv,
  *
  ****************************************************************************/
 
-static int  stm32l4can_delextfilter(FAR struct stm32l4_can_s *priv, int arg)
+#ifdef CONFIG_CAN_EXTID
+static int stm32l4can_delextfilter(FAR struct stm32l4_can_s *priv, int arg)
 {
   return -ENOTTY;
 }
+#endif
 
 /****************************************************************************
- * Name: stm32l4can_addextfilter
+ * Name: stm32l4can_addstdfilter
  *
  * Description:
  *   Add a filter for standard CAN IDs
@@ -1974,8 +1980,8 @@ static int  stm32l4can_delextfilter(FAR struct stm32l4_can_s *priv, int arg)
  *
  ****************************************************************************/
 
-static int  stm32l4can_addstdfilter(FAR struct stm32l4_can_s *priv,
-                                    FAR struct canioc_stdfilter_s *arg)
+static int stm32l4can_addstdfilter(FAR struct stm32l4_can_s *priv,
+                                   FAR struct canioc_stdfilter_s *arg)
 {
   return -ENOTTY;
 }
@@ -1998,7 +2004,7 @@ static int  stm32l4can_addstdfilter(FAR struct stm32l4_can_s *priv,
  *
  ****************************************************************************/
 
-static int  stm32l4can_delstdfilter(FAR struct stm32l4_can_s *priv, int arg)
+static int stm32l4can_delstdfilter(FAR struct stm32l4_can_s *priv, int arg)
 {
   return -ENOTTY;
 }