diff --git a/cmake/check_c_compiler_uses_glibc.cmake b/cmake/check_c_compiler_uses_glibc.cmake
index 46755bec..686a54c8 100644
--- a/cmake/check_c_compiler_uses_glibc.cmake
+++ b/cmake/check_c_compiler_uses_glibc.cmake
@@ -26,11 +26,11 @@ function(check_c_compiler_uses_glibc result_variable)
     int main() {
       void * buffer[1];
       int size = sizeof(buffer) / sizeof(void *);
-      backtrace(&buffer, size);
+      backtrace(buffer, size);
       return 0;
     }
   ]====])
 
   check_c_source_compiles("${GLIBC_TEST_CODE}" ${result_variable})
-  set(${result_variable} ${result_variable} PARENT_SCOPE)
+  set(${result_variable} ${${result_variable}} PARENT_SCOPE)
 endfunction()