diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 22b78c6ded6..190eb48546f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Wed Sep  3 10:39:42 1997  Jim Wilson  <wilson@cygnus.com>
+
+	* alias.c (true_dependence): Test x for BLKmode, in addition to mem.
+
 Wed Sep  3 09:28:50 CDT 1997  Joel Sherrill (joel@OARcorp.com)
 
 	* i386/go32-rtems.h, i386/rtems.h, i960/rtems.h, m68k/rtems.h,
diff --git a/gcc/alias.c b/gcc/alias.c
index 661ba1ea4b2..cb3a917c8da 100644
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -815,7 +815,7 @@ true_dependence (mem, mem_mode, x, varies)
      about aliasing.  */
   if (MEM_IN_STRUCT_P (x) == MEM_IN_STRUCT_P (mem)
       || mem_mode == QImode || mem_mode == BLKmode
-      || GET_MODE (x) == QImode || GET_MODE (mem) == BLKmode
+      || GET_MODE (x) == QImode || GET_MODE (x) == BLKmode
       || varies (x_addr) == varies (mem_addr))
     return 1;