diff --git a/package/portmap/portmap.mk b/package/portmap/portmap.mk
index a41044318..5caf54cb2 100644
--- a/package/portmap/portmap.mk
+++ b/package/portmap/portmap.mk
@@ -22,7 +22,7 @@ endef
 
 define PORTMAP_INSTALL_TARGET_CMDS
 	for sbin in $(PORTMAP_SBINS); do \
-		$(INSTALL) -D $(@D)/$$sbin $(TARGET_DIR)/sbin/$$sbin; \
+		$(INSTALL) -D -m 0755 $(@D)/$$sbin $(TARGET_DIR)/sbin/$$sbin || exit 1; \
 	done
 endef