1 files changed, 2 insertions, 0 deletions
diff --git a/libs.mk b/libs.mk
index 25fbc2cb9..c7c274810 100644
--- a/libs.mk
+++ b/libs.mk
@@ -133,6 +133,8 @@ ifeq ($(CONFIG_VP9_DECODER),yes)
   CODEC_DOC_SECTIONS += vp9 vp9_decoder
 endif
 
+VP9_PREFIX=vp9/
+$(BUILD_PFX)$(VP9_PREFIX)%.c.o: CFLAGS += -Wextra
 
 ifeq ($(CONFIG_ENCODERS),yes)
   CODEC_DOC_SECTIONS += encoder