diff --git a/cmake/prebuild.cmake b/cmake/prebuild.cmake
index 02ab708..b51bd0b 100644
--- a/cmake/prebuild.cmake
+++ b/cmake/prebuild.cmake
@@ -87,7 +87,7 @@ file(MAKE_DIRECTORY ${GETARCH_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GETARCH_RESULT ${GETARCH_DIR}
     SOURCES ${GETARCH_SRC}
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GETARCH_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GETARCH_BIN}
   )
@@ -114,7 +114,7 @@ file(MAKE_DIRECTORY ${GETARCH2_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GETARCH2_RESULT ${GETARCH2_DIR}
     SOURCES ${PROJECT_SOURCE_DIR}/getarch_2nd.c
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GETARCH2_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GETARCH2_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GETARCH2_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GETARCH2_BIN}
   )
@@ -141,7 +141,7 @@ file(MAKE_DIRECTORY ${GEN_CONFIG_H_DIR})
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsStore")
   try_compile(GEN_CONFIG_H_RESULT ${GEN_CONFIG_H_DIR}
     SOURCES ${PROJECT_SOURCE_DIR}/gen_config_h.c
-    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GEN_CONFIG_H_FLAGS} -I${PROJECT_SOURCE_DIR}
+    COMPILE_DEFINITIONS ${EXFLAGS} ${GETARCH_FLAGS} ${GEN_CONFIG_H_FLAGS} -I"${PROJECT_SOURCE_DIR}"
     OUTPUT_VARIABLE GEN_CONFIG_H_LOG
     COPY_FILE ${PROJECT_BINARY_DIR}/${GEN_CONFIG_H_BIN}
   )