diff --git a/cores/libretro-ffmpeg/Makefile.ffmpeg b/cores/libretro-ffmpeg/Makefile.ffmpeg
index ca1eea19fd..3e3ca65d4b 100644
--- a/cores/libretro-ffmpeg/Makefile.ffmpeg
+++ b/cores/libretro-ffmpeg/Makefile.ffmpeg
@@ -337,7 +337,7 @@ DEFINES += -DHAVE_ATOMICS_GCC=1 -DHAVE_ATOMICS_NATIVE=1
 endif
 
 ifeq ($(WIN32_PLATFORM),1)
-DEFINES += HAVE_ATOMICS_WIN32=1 -DHAVE_ATOMICS_NATIVE=1
+DEFINES += -DHAVE_ATOMICS_WIN32=1 -DHAVE_ATOMICS_NATIVE=1
 endif
 
 ifeq ($(HAVE_PTHREADS),1)