diff --git a/radio/src/tests/CMakeLists.txt b/radio/src/tests/CMakeLists.txt
index 7b5bf8db2..1f51cfebf 100644
--- a/radio/src/tests/CMakeLists.txt
+++ b/radio/src/tests/CMakeLists.txt
@@ -1,5 +1,5 @@
-set(GTEST_INCDIR /usr/include/gtest)
-set(GTEST_SRCDIR /usr/src/gtest)
+set(GTEST_INCDIR /usr/include/gtest CACHE string "Location of Google Test includes")
+set(GTEST_SRCDIR /usr/src/gtest CACHE string "Location of Google Test directory")
 
 if(EXISTS "${GTEST_SRCDIR}/src/gtest-all.cc")
   if(Qt5Widgets_FOUND)
@@ -35,4 +35,4 @@ if(EXISTS "${GTEST_SRCDIR}/src/gtest-all.cc")
   endif()
 else()
   message("WARNING: can't find gtests source, gtest target will not be available!")
-endif()
\ No newline at end of file
+endif()