diff --git a/c/Makefile b/c/Makefile
index 6767a6bf..967df0d4 100644
--- a/c/Makefile
+++ b/c/Makefile
@@ -65,8 +65,9 @@ native_test: native
 	@./native_test_runner
 
 .PHONY: clean
+clean: SHELL := bash
 clean:
-	@rm -rf build dist {.,*,*/*}/{*.pyc,__pycache__,.mypy_cache,.pytest_cache,.benchmarks} || echo
+	@rm -rf build dist {.,*,*/*{,/*}}/{*.pyc,__pycache__,.mypy_cache,.pytest_cache,.benchmarks} || echo
 
 dist/c-lib.wasm: build/lib.c
 	@mkdir -p dist
diff --git a/cplusplus/Makefile b/cplusplus/Makefile
index eb6b7862..4a9ae6e3 100644
--- a/cplusplus/Makefile
+++ b/cplusplus/Makefile
@@ -57,6 +57,7 @@ native_test: native
 	@./native_test_runner
 
 .PHONY: clean
+clean: SHELL := bash
 clean:
 	@rm -rf build dist {.,*,*/*}/{*.pyc,__pycache__,.mypy_cache,.pytest_cache,.benchmarks} || echo