diff --git a/cmake/backtrace.cmake b/cmake/backtrace.cmake
index b8ad79f6..5a446e89 100644
--- a/cmake/backtrace.cmake
+++ b/cmake/backtrace.cmake
@@ -45,10 +45,12 @@ if(HAVE_BACKTRACE)
     if(HAS_RDYNAMIC)
         list(INSERT BACKTRACE_LDFLAGS 0 -rdynamic)
     endif()
-    # cmake scope fun
-    set(HAVE_BACKTRACE ${HAVE_BACKTRACE} PARENT_SCOPE)
 else()
     set(BACKTRACE_CFLAGS "")
     set(BACKTRACE_LDFLAGS "")
 endif()
 
+# cmake scope fun
+set(HAVE_BACKTRACE ${HAVE_BACKTRACE} CACHE BOOL INTERNAL)
+set(BACKTRACE_CFLAGS ${BACKTRACE_CFLAGS} CACHE STRING INTERNAL)
+set(BACKTRACE_LDFLAGS ${BACKTRACE_LDFLAGS} CACHE STRING INTERNAL)