diff --git a/configure b/configure
index 65a8884d11..af3c09f7c5 100755
--- a/configure
+++ b/configure
@@ -3319,6 +3319,8 @@ config_files="$TMPH config.mak"
 
 cat > config.mak <<EOF
 # Automatically generated by configure - do not modify!
+ifndef FFMPEG_CONFIG_MAK
+FFMPEG_CONFIG_MAK=1
 FFMPEG_CONFIGURATION=$FFMPEG_CONFIGURATION
 prefix=$prefix
 LIBDIR=\$(DESTDIR)$libdir
@@ -3461,6 +3463,7 @@ SEEK_TESTS=$(print_enabled   -n _test $SEEK_TESTS)
 EOF
 
 echo "#endif /* FFMPEG_CONFIG_H */" >> $TMPH
+echo "endif # FFMPEG_CONFIG_MAK" >> config.mak
 
 # Do not overwrite an unchanged config.h to avoid superfluous rebuilds.
 cp_if_changed $TMPH config.h