diff --git a/configure b/configure
index 4164557df9..7806a216db 100755
--- a/configure
+++ b/configure
@@ -3058,6 +3058,7 @@ test -n "$malloc_prefix" &&
     echo "#define MALLOC_PREFIX $malloc_prefix" >>$TMPH
 
 if enabled small || disabled optimizations; then
+    echo "#undef  av_always_inline"  >> $TMPH
     echo "#define av_always_inline"  >> $TMPH
 fi