diff --git a/Makefile b/Makefile
index a93930e9b..cc1476d4b 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,11 @@ cmake-build: $(BUILDDIR)/Makefile
 	$(ECHO) "Building…"
 	$(MAKE) -C $(BUILDDIR)
 
+# Run CMake with CMAKE_ARGS defined on command line ("make CMAKE_ARGS=…").
+ifeq ($(origin CMAKE_ARGS),command line)
+.PHONY: $(BUILDDIR)/Makefile
+endif
+
 $(BUILDDIR)/Makefile:
 	$(ECHO) "Creating build directory and running cmake in it. You can also run CMake directly, if you want."
 	$(ECHO)