diff --git a/submodules/build/builder-iphone-os.mk b/submodules/build/builder-iphone-os.mk
index fd7a296c8..0ac359c94 100644
--- a/submodules/build/builder-iphone-os.mk
+++ b/submodules/build/builder-iphone-os.mk
@@ -219,7 +219,7 @@ clean-makefile-speex:
 
 build-libgsm:
 	cp -rf $(BUILDER_SRC_DIR)/$(gsm_dir) $(BUILDER_BUILD_DIR)/$(gsm_dir)
-	rm -f $(BUILDER_BUILD_DIR)/$(gsm_dir)/.git
+	rm -rf $(BUILDER_BUILD_DIR)/$(gsm_dir)/.git
 	rm -f $(prefix)/lib/libgsm.a
 	rm -rf $(prefix)/include/gsm
 	cd $(BUILDER_BUILD_DIR)/$(gsm_dir)\