diff --git a/Makefile b/Makefile
index f2f9042..9d93131 100644
--- a/Makefile
+++ b/Makefile
@@ -67,7 +67,7 @@ unit: unit.o text.o
 	$(CXX) -MMD $(PG) $(INCLUDES) $(FINAL_FLAGS) $(CXXFLAGS) -c -o $@ $<
 
 clean:
-	rm -f tippecanoe *.o *.d
+	rm -f tippecanoe *.o *.d */*.o */*.d
 
 indent:
 	clang-format -i -style="{BasedOnStyle: Google, IndentWidth: 8, UseTab: Always, AllowShortIfStatementsOnASingleLine: false, ColumnLimit: 0, ContinuationIndentWidth: 8, SpaceAfterCStyleCast: true, IndentCaseLabels: false, AllowShortBlocksOnASingleLine: false, AllowShortFunctionsOnASingleLine: false, SortIncludes: false}" $(C) $(H)