diff --git a/testsuite/ltrace.minor/attach-process.exp b/testsuite/ltrace.minor/attach-process.exp

index 1249bd3..bf9dbb0 100644

--- a/testsuite/ltrace.minor/attach-process.exp

+++ b/testsuite/ltrace.minor/attach-process.exp

@@ -18,7 +18,9 @@

 set bin [ltraceCompile {} [ltraceSource c {

     #include <unistd.h>

+    #include <sys/prctl.h>

     int main(void) {

+	(void) prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);

 	sleep(5);

 	sleep(1);

 	return 0;