diff --git a/src/platform/qt/CMakeLists.txt b/src/platform/qt/CMakeLists.txt
index 20e8f0315..579115c3d 100644
--- a/src/platform/qt/CMakeLists.txt
+++ b/src/platform/qt/CMakeLists.txt
@@ -169,7 +169,7 @@ else()
 endif()
 install(DIRECTORY ${CMAKE_SOURCE_DIR}/res/shaders DESTINATION ${SHADER_DIR} COMPONENT ${BINARY_NAME}-qt)
 if(NOT WIN32 AND NOT APPLE)
-	list(APPEND QT_DEFINES QT_SHADER_DIR ${SHADER_DIR}/shaders)
+	list(APPEND QT_DEFINES QT_SHADER_DIR="${SHADER_DIR}/shaders")
 endif()
 
 add_executable(${BINARY_NAME}-qt WIN32 MACOSX_BUNDLE main.cpp ${CMAKE_SOURCE_DIR}/res/mgba.icns ${SOURCE_FILES} ${PLATFORM_SRC} ${UI_FILES} ${AUDIO_SRC} ${RESOURCES})