diff --git a/makefile b/makefile
index 63587b87..e3fbf5b5 100644
--- a/makefile
+++ b/makefile
@@ -1007,7 +1007,7 @@ else
   endif
 endif # Win32 (via MinGW)
 ifneq (,$(GIT_COMMIT_ID))
-  CFLAGS_GIT = -DSIM_GIT_COMMIT_ID=$(GIT_COMMIT_ID) -DSIM_GIT_COMMIT_TIME=$(GIT_COMMIT_TIME)
+  CFLAGS_GIT = -DSIM_GIT_COMMIT_ID=$(GIT_COMMIT_ID)
 endif
 ifneq (,$(GIT_COMMIT_TIME))
   CFLAGS_GIT += -DSIM_GIT_COMMIT_TIME=$(GIT_COMMIT_TIME)