diff --git a/tests/lib/libexecinfo/t_backtrace.c b/tests/lib/libexecinfo/t_backtrace.c
index da69207e727..32e8994396c 100644
--- a/tests/lib/libexecinfo/t_backtrace.c
+++ b/tests/lib/libexecinfo/t_backtrace.c
@@ -47,7 +47,7 @@ void myfunc2(size_t ncalls);
 void myfunc1(size_t origcalls, volatile size_t ncalls);
 void myfunc(size_t ncalls);
 
-volatile int prevent_inline;
+static volatile int prevent_inline;
 
 void
 myfunc3(size_t ncalls)