diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8918dec2290..6ba3eca7a99 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2010-04-13  Richard Guenther  <rguenther@suse.de>
+
+	PR bootstrap/43737
+	* builtins.c (c_readstr): Fix assert.
+
 2010-04-13  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (extendsidi2 splitter): Also check for DX_REG
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 7787f695ac8..65a1dbd5882 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -560,7 +560,7 @@ c_readstr (const char *str, enum machine_mode mode)
 	  && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
 	j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
       j *= BITS_PER_UNIT;
-      gcc_assert (j <= 2 * HOST_BITS_PER_WIDE_INT);
+      gcc_assert (j < 2 * HOST_BITS_PER_WIDE_INT);
 
       if (ch)
 	ch = (unsigned char) str[i];