diff --git a/gdb/testsuite/gdb.arch/amd64-disp-step.exp b/gdb/testsuite/gdb.arch/amd64-disp-step.exp
--- a/gdb/testsuite/gdb.arch/amd64-disp-step.exp
+++ b/gdb/testsuite/gdb.arch/amd64-disp-step.exp
@@ -222,7 +222,10 @@ proc rip_test { reg test_start_label tes
 	    # If we use 'signal' to send the signal GDB doesn't actually do
 	    # the displaced step, but instead just delivers the signal.
 	    set inferior_pid [get_inferior_pid]
-	    remote_exec target "kill -ALRM $inferior_pid"
+	    # Ensure that $inferior_pid refers to a single process.
+	    if {$inferior_pid > 0} {
+		remote_exec target "kill -ALRM $inferior_pid"
+	    }
 	}
 
 	gdb_test "continue" \