diff --git a/makefile b/makefile
index d8cd4f9df8..52266b30f2 100755
--- a/makefile
+++ b/makefile
@@ -872,7 +872,7 @@ endif
 class-name = $(patsubst $(1)/%.class,%,$(2))
 class-names = $(foreach x,$(2),$(call class-name,$(1),$(x)))
 
-test-flags = -cp $(build)/test
+test-flags = -Djava.library.path=$(build) -cp $(build)/test
 
 test-args = $(test-flags) $(input)