diff --git a/hdr.c b/hdr.c
index 6caeb38..bc59f75 100644
--- a/hdr.c
+++ b/hdr.c
@@ -54,7 +54,7 @@ headerall(char *file)
 		return;
 
 	char *h = 0;
-	while (h = blaze822_next_header(msg, h))
+	while ((h = blaze822_next_header(msg, h)))
 		printhdr(h);
 }
 
diff --git a/thread.c b/thread.c
index aa2d377..0b89df2 100644
--- a/thread.c
+++ b/thread.c
@@ -264,7 +264,7 @@ print_tree(struct container *c, int depth)
 	
 		if (c->child)
 			print_tree(c->child, depth+1);
-	} while (c = c->next);
+	} while ((c = c->next));
 }
 
 int