diff --git a/ChangeLog b/ChangeLog
index b8e1467819..9028a2e533 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+Tue Mar 22 10:31:34 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* time.c (wdiv, wmod): wdivmod0() assumes the 3rd and the 4th arguments
+	  are valid pointers.
+	  maybe checking them in wdivmod0() is better manner, but I guess that
+	  passing real dummy pointers may be faster than checking and branching
+	  in wdivmod0().
+	  this commit fixes SEGV on 32bit and LLP64 platforms.
+
 Tue Mar 22 10:24:04 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* time.c (divmodv): void function never returns any value.
diff --git a/time.c b/time.c
index 2b37bdef71..11602bf8cc 100644
--- a/time.c
+++ b/time.c
@@ -461,8 +461,8 @@ static wideval_t
 wdiv(wideval_t wx, wideval_t wy)
 {
 #if WIDEVALUE_IS_WIDER
-    wideval_t q;
-    if (wdivmod0(wx, wy, &q, NULL)) return q;
+    wideval_t q, dmy;
+    if (wdivmod0(wx, wy, &q, &dmy)) return q;
 #endif
     return v2w(div(w2v(wx), w2v(wy)));
 }
@@ -471,8 +471,8 @@ static wideval_t
 wmod(wideval_t wx, wideval_t wy)
 {
 #if WIDEVALUE_IS_WIDER
-    wideval_t r;
-    if (wdivmod0(wx, wy, NULL, &r)) return r;
+    wideval_t r, dmy;
+    if (wdivmod0(wx, wy, &dmy, &r)) return r;
 #endif
     return v2w(mod(w2v(wx), w2v(wy)));
 }