diff --git a/test/unit/Makefile b/test/unit/Makefile
index c4e5c5d..6ed710a 100644
--- a/test/unit/Makefile
+++ b/test/unit/Makefile
@@ -4,7 +4,7 @@ OBJDIR ?= objs/$(ARCH)
 .PHONY: all clean
 
 all: Makefile.include
-	git submodule update --init --rebase
+	cd $(shell git rev-parse --show-toplevel) && git submodule update --init --rebase
 	$(MAKE) -C $(OBJDIR)
 
 clean: Makefile.include