diff --git a/Makefile b/Makefile
index 4a51985..01e6959 100644
--- a/Makefile
+++ b/Makefile
@@ -359,7 +359,7 @@
 SUBVERS := $(shell (grep -v '^\$$' SUBVERS 2>/dev/null || touch SUBVERS) | head -n 1)
 endif
 ifeq ($(VERDATE),)
-VERDATE := $(shell (grep -v '^\$$' VERDATE 2>/dev/null || touch VERDATE) | head -n 1)
+VERDATE := $(shell (grep -v '^\$$' VERDATE 2>/dev/null || touch VERDATE) | head -n 1 | cut -f1 -d' ' | tr '-' '/')
 endif
 
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