diff --git a/sys/src/cmd/cc/macbody b/sys/src/cmd/cc/macbody
index 7d837fb43..b6cf60e78 100644
--- a/sys/src/cmd/cc/macbody
+++ b/sys/src/cmd/cc/macbody
@@ -854,9 +854,16 @@ gethunk(void)
 	char *h;
 	long nh;
 
-	nh = NHUNK;
-	if(thunk >= 10L*NHUNK)
+	if(thunk >= 100L*NHUNK)
+		nh = 100L*NHUNK;
+	else if(thunk >= 50L*NHUNK)
+		nh = 50L*NHUNK;
+	else if(thunk >= 25L*NHUNK)
+		nh = 25L*NHUNK;
+	else if(thunk >= 10L*NHUNK)
 		nh = 10L*NHUNK;
+	else
+		nh = NHUNK;
 	h = (char*)mysbrk(nh);
 	if(h == (char*)-1) {
 		yyerror("out of memory");