diff --git a/Makefile b/Makefile
index b6ee119..14e5d03 100644
--- a/Makefile
+++ b/Makefile
@@ -58,9 +58,9 @@ target/debug/$(EXTENSION_FILENAME): target/debug/$(EXTENSION_LIB_FILENAME)
 			-p $(DUCKDB_PLATFORM)
 
 build/debug/$(EXTENSION_FILENAME): target/debug/$(EXTENSION_LIB_FILENAME)
-	$(shell $(PYTHON_VENV_BIN) -c "from pathlib import Path;Path('./build/debug/extension/$(EXTENSION_NAME)').mkdir(parents=True, exist_ok=True)")
-	cp target/debug/$(EXTENSION_LIB_FILENAME) build/debug/$(EXTENSION_FILENAME)
-	cp target/debug/$(EXTENSION_LIB_FILENAME) build/debug/extension/$(EXTENSION_NAME)/$(EXTENSION_FILENAME)
+	$(PYTHON_VENV_BIN) -c "from pathlib import Path;Path('./build/debug/extension/$(EXTENSION_NAME)').mkdir(parents=True, exist_ok=True)"
+	$(PYTHON_VENV_BIN) -c "import shutil;shutil.copyfile('target/debug/$(EXTENSION_LIB_FILENAME)', 'build/debug/$(EXTENSION_FILENAME)')"
+	$(PYTHON_VENV_BIN) -c "import shutil;shutil.copyfile('target/debug/$(EXTENSION_LIB_FILENAME)', 'build/debug/extension/$(EXTENSION_NAME)/$(EXTENSION_FILENAME)')"
 
 debug: target/debug/$(EXTENSION_FILENAME) build/debug/$(EXTENSION_FILENAME)
 
@@ -78,9 +78,9 @@ target/release/$(EXTENSION_FILENAME): target/release/$(EXTENSION_LIB_FILENAME)
 			-p $(DUCKDB_PLATFORM)
 
 build/release/$(EXTENSION_FILENAME): target/release/$(EXTENSION_LIB_FILENAME)
-	$(shell $(PYTHON_VENV_BIN) -c "from pathlib import Path;Path('./build/release/extension/$(EXTENSION_NAME)').mkdir(parents=True, exist_ok=True)")
-	cp target/release/$(EXTENSION_LIB_FILENAME) build/release/$(EXTENSION_FILENAME)
-	cp target/release/$(EXTENSION_LIB_FILENAME) build/release/extension/$(EXTENSION_NAME)/$(EXTENSION_FILENAME)
+	$(PYTHON_VENV_BIN) -c "from pathlib import Path;Path('./build/release/extension/$(EXTENSION_NAME)').mkdir(parents=True, exist_ok=True)"
+	$(PYTHON_VENV_BIN) -c "import shutil;shutil.copyfile('target/release/$(EXTENSION_LIB_FILENAME)', 'build/release/$(EXTENSION_FILENAME)')"
+	$(PYTHON_VENV_BIN) -c "import shutil;shutil.copyfile('target/release/$(EXTENSION_LIB_FILENAME)', 'build/release/extension/$(EXTENSION_NAME)/$(EXTENSION_FILENAME)')"
 
 release: target/release/$(EXTENSION_FILENAME) build/release/$(EXTENSION_FILENAME)