diff --git a/build/makefile_base.mak b/build/makefile_base.mak
index 32ba6b14..80852917 100644
--- a/build/makefile_base.mak
+++ b/build/makefile_base.mak
@@ -986,9 +986,9 @@ $(DXVK_CONFIGURE_FILES64): $(MAKEFILE_DEP) $(DXVK)/build-win64.txt | $(DXVK_OBJ6
 	mkdir -p "$(abspath $(DXVK_OBJ64))/new_includes" && \
 	cp $(abspath $(TOOLS_DIR64))/include/wine/windows/dxgi*.h "$(abspath $(DXVK_OBJ64))/new_includes" && \
 	cd "$(abspath $(DXVK))" && \
-	sed -e "s|@PROTON_C_ARGS@|'-I$(abspath $(DXVK_OBJ64))/new_includes'|" < build-win64.txt > proton-build-win64.txt && \
+	sed -e "s|@PROTON_C_ARGS@|'-I$(abspath $(DXVK_OBJ64))/new_includes'|" < build-win64.txt > "$(abspath $(DXVK_OBJ64))/proton-build-win64.txt" && \
 	PATH="$(abspath $(SRCDIR))/glslang/bin/:$(PATH)" \
-		meson --prefix="$(abspath $(DXVK_OBJ64))" --cross-file proton-build-win64.txt --strip --buildtype=release "$(abspath $(DXVK_OBJ64))"
+		meson --prefix="$(abspath $(DXVK_OBJ64))" --cross-file "$(abspath $(DXVK_OBJ64))/proton-build-win64.txt" --strip --buildtype=release "$(abspath $(DXVK_OBJ64))"
 
 # 32-bit configure.  Remove coredata file if already configured (due to e.g. makefile changing)
 #   the sed junk is to work around meson not supporting command line args for --cross-file builds
@@ -1001,9 +1001,9 @@ $(DXVK_CONFIGURE_FILES32): $(MAKEFILE_DEP) $(DXVK)/build-win32.txt | $(DXVK_OBJ3
 	mkdir -p "$(abspath $(DXVK_OBJ32))/new_includes" && \
 	cp $(abspath $(TOOLS_DIR32))/include/wine/windows/dxgi*.h "$(abspath $(DXVK_OBJ32))/new_includes" && \
 	cd "$(abspath $(DXVK))" && \
-	sed -e "s|@PROTON_C_ARGS@|'-I$(abspath $(DXVK_OBJ32))/new_includes'|" < build-win32.txt > proton-build-win32.txt && \
+	sed -e "s|@PROTON_C_ARGS@|'-I$(abspath $(DXVK_OBJ32))/new_includes'|" < build-win32.txt > "$(abspath $(DXVK_OBJ32))/proton-build-win32.txt" && \
 	PATH="$(abspath $(SRCDIR))/glslang/bin/:$(PATH)" \
-		meson --prefix="$(abspath $(DXVK_OBJ32))" --cross-file proton-build-win32.txt --strip --buildtype=release "$(abspath $(DXVK_OBJ32))"
+		meson --prefix="$(abspath $(DXVK_OBJ32))" --cross-file "$(abspath $(DXVK_OBJ32))/proton-build-win32.txt" --strip --buildtype=release "$(abspath $(DXVK_OBJ32))"
 
 ## dxvk goals
 DXVK_TARGETS = dxvk dxvk_configure dxvk32 dxvk64 dxvk_configure32 dxvk_configure64