diff --git a/libavutil/aarch64/asm.S b/libavutil/aarch64/asm.S
index 7e2af4df17..15b55d57d2 100644
--- a/libavutil/aarch64/asm.S
+++ b/libavutil/aarch64/asm.S
@@ -23,7 +23,7 @@
 #ifdef __ELF__
 #   define ELF
 #else
-#   define ELF  #
+#   define ELF #
 #endif
 
 #if HAVE_AS_FUNC