diff --git a/src/platform/qt/CMakeLists.txt b/src/platform/qt/CMakeLists.txt
index f33c292ee..800883ed0 100644
--- a/src/platform/qt/CMakeLists.txt
+++ b/src/platform/qt/CMakeLists.txt
@@ -209,13 +209,13 @@ if(NOT DEFINED DATADIR)
 	if(APPLE)
 		set(DATADIR Applications/${PROJECT_NAME}.app/Contents/Resources)
 	else()
-		set(DATADIR ${CMAKE_INSTALL_FULL_DATADIR}/${BINARY_NAME})
+		set(DATADIR ${CMAKE_INSTALL_DATADIR}/${BINARY_NAME})
 	endif()
 endif()
 install(DIRECTORY ${CMAKE_SOURCE_DIR}/res/shaders DESTINATION ${DATADIR} COMPONENT ${BINARY_NAME}-qt)
 install(FILES ${CMAKE_SOURCE_DIR}/res/nointro.dat DESTINATION ${DATADIR} COMPONENT ${BINARY_NAME}-qt)
 if(NOT WIN32 AND NOT APPLE)
-	list(APPEND QT_DEFINES DATADIR="${DATADIR}")
+	list(APPEND QT_DEFINES DATADIR="${CMAKE_INSTALL_PREFIX}/${DATADIR}")
 endif()
 
 find_package(Qt5LinguistTools)
@@ -253,7 +253,7 @@ install(TARGETS ${BINARY_NAME}-qt
 if(UNIX AND NOT APPLE)
 	find_program(DESKTOP_FILE_INSTALL desktop-file-install)
 	if(DESKTOP_FILE_INSTALL)
-		install(CODE "execute_process(COMMAND ${DESKTOP_FILE_INSTALL} \"${CMAKE_SOURCE_DIR}/res/mgba-qt.desktop\" --dir \"\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATADIR}/applications/\")")
+		install(CODE "execute_process(COMMAND ${DESKTOP_FILE_INSTALL} \"${CMAKE_SOURCE_DIR}/res/mgba-qt.desktop\" --dir \"\$ENV{DESTDIR}\${CMAKE_INSTALL_FULL_DATADIR}/applications/\")")
 	endif()
 endif()
 if(UNIX)