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

index ac61347..afb8b75 100644

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

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

@@ -29,7 +29,9 @@ spawn [ltraceCompile exe -ldl [ltraceSource c {

     #include <assert.h>

     #include <stdio.h>

     #include <string.h>

+    #include <sys/prctl.h>

     int main(int argc, char **argv) {

+	(void) prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);

 	assert(argc == 2);

     #define FN "libll.so"

 	char buf[strlen(argv[1]) + 1 + sizeof FN];