diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6480298..9eaf2e7 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -26,4 +26,4 @@
 
 TESTS = basic.sh
 
-AM_TESTS_ENVIRONMENT = export VERSION=$(VERSION); export EXEEXT=$(EXEEXT);
+TESTS_ENVIRONMENT = export VERSION=$(VERSION); export EXEEXT=$(EXEEXT);