diff --git a/src/base/pspdev.cmake b/src/base/pspdev.cmake
index 2c3a8d34..9daa3c98 100644
--- a/src/base/pspdev.cmake
+++ b/src/base/pspdev.cmake
@@ -15,7 +15,7 @@ SET(CMAKE_EXE_LINKER_FLAGS_INIT "-L${PSPDEV}/lib -L${PSPDEV}/psp/lib -L${PSPDEV}
 #SET(CMAKE_SHARED_LINKER_FLAGS_INIT "...")
 #SET(CMAKE_STATIC_LINKER_FLAGS_CONFIG_INIT "...")
 #SET(CMAKE_STATIC_LINKER_FLAGS_INIT "...")
-SET(CMAKE_INSTALL_PREFIX ${PSPDEV}/psp/)
+SET(CMAKE_INSTALL_PREFIX "${PSPDEV}/psp" CACHE PATH "install path")
 
 SET(CMAKE_FIND_ROOT_PATH ${PSPDEV} ${PSPDEV}/psp ${PSPDEV}/psp/sdk)
 SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)