diff --git a/debian/rules b/debian/rules
index 3827c0f5..79ac1d6f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -798,7 +798,7 @@ debian-libclc-build:
 	-DCMAKE_INSTALL_INCLUDEDIR=include \
 	-DLLVM_CMAKE_DIR=$(STAGE_2_BIN_DIR)/../ \
 	$(LIBCLC_LLVM_SPIRV) \
-	-DLIBCLC_TARGETS_TO_BUILD=$(LIBCLC_TARGETS_TO_BUILD); \
+	-DLIBCLC_TARGETS_TO_BUILD="$(LIBCLC_TARGETS_TO_BUILD)"; \
 	LD_LIBRARY_PATH=$$LD_LIBRARY_PATH:$(STAGE_2_LIB_DIR) ninja -j $(NJOBS) $(VERBOSE)
 ifndef LLVM_SPIRV
 	echo "libclc built without SPIRV (.spv) outputs because llvm-spirv wasn't found"