diff --git a/version.h b/version.h
index 58af5634f5..272ccd24ff 100644
--- a/version.h
+++ b/version.h
@@ -14,12 +14,14 @@
 #define ONLY_ONE_DIGIT(x) TOKEN_PASTE(10,x) < 1000
 #define RUBY_RELEASE_YEAR_STR STRINGIZE(RUBY_RELEASE_YEAR)
 #if ONLY_ONE_DIGIT(RUBY_RELEASE_MONTH)
-#define RUBY_RELEASE_MONTH_STR STRINGIZE(12)STRINGIZE(RUBY_RELEASE_MONTH)
+#define RUBY_RELEASE_MONTH_STR \
+    "0"STRINGIZE(RUBY_RELEASE_MONTH)
 #else
 #define RUBY_RELEASE_MONTH_STR STRINGIZE(RUBY_RELEASE_MONTH)
 #endif
 #if ONLY_ONE_DIGIT(RUBY_RELEASE_DAY)
-#define RUBY_RELEASE_DAY_STR STRINGIZE(25)STRINGIZE(RUBY_RELEASE_DAY)
+#define RUBY_RELEASE_DAY_STR \
+    "0"STRINGIZE(RUBY_RELEASE_DAY)
 #else
 #define RUBY_RELEASE_DAY_STR STRINGIZE(RUBY_RELEASE_DAY)
 #endif