diff --git a/gcc/config/a29k/a29k.h b/gcc/config/a29k/a29k.h
index f04cf30b2e5..988e893e4a0 100644
--- a/gcc/config/a29k/a29k.h
+++ b/gcc/config/a29k/a29k.h
@@ -133,7 +133,7 @@ extern int target_flags;
 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)  \
   if (GET_MODE_CLASS (MODE) == MODE_INT	\
       && GET_MODE_SIZE (MODE) < 4)  	\
-    (MODE) == SImode;
+    (MODE) = SImode;
 
 /* Define this if most significant bit is lowest numbered
    in instructions that operate on numbered bit-fields.
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index b5cc26a2f50..7e8e0cd6ab3 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -114,7 +114,7 @@ extern int target_flags;
 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)  \
   if (GET_MODE_CLASS (MODE) == MODE_INT	\
       && GET_MODE_SIZE (MODE) < 4)  	\
-    (MODE) == SImode;
+    (MODE) = SImode;
 
 /* Define this if most significant bit is lowest numbered
    in instructions that operate on numbered bit-fields. */