diff --git a/tool/build/compile.c b/tool/build/compile.c
index 85cdd1cc7..ee0893ac0 100644
--- a/tool/build/compile.c
+++ b/tool/build/compile.c
@@ -777,7 +777,7 @@ int main(int argc, char *argv[]) {
         ccversion = atoi(optarg);
         break;
       case 'P':
-        fszquota = sizetol(optarg, 1000);
+        proquota = sizetol(optarg, 1024);
         break;
       case 'F':
         fszquota = sizetol(optarg, 1000);