diff --git a/ext/date/lib/timelib.h b/ext/date/lib/timelib.h
index 2848c11b91f..550015158c7 100644
--- a/ext/date/lib/timelib.h
+++ b/ext/date/lib/timelib.h
@@ -39,6 +39,22 @@
 #include <limits.h>
 #include <inttypes.h>
 
+# ifndef HAVE_INT32_T
+#  if SIZEOF_INT == 4
+typedef int int32_t;
+#  elif SIZEOF_LONG == 4
+typedef long int int32_t;
+#  endif
+# endif
+
+# ifndef HAVE_UINT32_T
+#  if SIZEOF_INT == 4
+typedef unsigned int uint32_t;
+#  elif SIZEOF_LONG == 4
+typedef unsigned long int uint32_t;
+#  endif
+# endif
+
 #ifdef _WIN32
 # if _MSC_VER >= 1600
 # include <stdint.h>