diff --git a/Makefile.in b/Makefile.in
index 9f87de21c..70542df65 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -21,7 +21,7 @@ staticexe=@staticexe@
 EXEEXT=@EXEEXT@
 configfile=@ub_conf_file@
 UNBOUND_RUN_DIR=@UNBOUND_RUN_DIR@
-CHECKLOCK_SRC="testcode/checklocks.c"
+CHECKLOCK_SRC=testcode/checklocks.c
 CHECKLOCK_OBJ=@CHECKLOCK_OBJ@
 WITH_PYTHONMODULE=@WITH_PYTHONMODULE@
 WITH_PYUNBOUND=@WITH_PYUNBOUND@