diff --git a/debian/rules b/debian/rules
index ef61242b..83ffd9f1 100755
--- a/debian/rules
+++ b/debian/rules
@@ -271,8 +271,8 @@ endif
 LIBCLC_TARGETS_TO_BUILD="amdgcn--;amdgcn--amdhsa;amdgcn-mesa-mesa3d;r600--;nvptx--;nvptx64--;nvptx--nvidiacl;nvptx64--nvidiacl"
 LIBCLC_LLVM_SPIRV =
 ifeq ($(LLVM_SPIRV_INSTALLED),yes)
-	LIBCLC_TARGETS_TO_BUILD := $(LIBCLC_TARGETS_TO_BUILD)";spirv-mesa3d-;spirv64-mesa3d-"
-	LIBCLC_LLVM_SPIRV = "-DLLVM_SPIRV=$(LLVM_SPIRV)"
+	LIBCLC_TARGETS_TO_BUILD := $(LIBCLC_TARGETS_TO_BUILD);spirv-mesa3d-;spirv64-mesa3d-
+	LIBCLC_LLVM_SPIRV = -DLLVM_SPIRV=$(LLVM_SPIRV)
 endif
 
 BINUTILS_GOLD_ARCHS := amd64 arm64 armhf i386 ppc64 ppc64el x32 s390x hurd-i386 kfreebsd-amd64 kfreebsd-i386