diff --git a/tests/Makefile b/tests/Makefile
index 4787f25..d85617f 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -35,7 +35,7 @@
 SHARED_SUFFIX=.$(DLEXT)
 endif
 else
-DLEXT=so
+DLEXT ?= so
 EXEXT=
 SHARED_SUFFIX=
 endif