diff --git a/gdbserver_tests/nlpasssigalrm.stdinB.gdb b/gdbserver_tests/nlpasssigalrm.stdinB.gdb
index 0a52d30dc..2f914e524 100644
--- a/gdbserver_tests/nlpasssigalrm.stdinB.gdb
+++ b/gdbserver_tests/nlpasssigalrm.stdinB.gdb
@@ -3,9 +3,9 @@ target remote | ./vgdb --wait=60 --vgdb-prefix=./vgdb-prefix-nlpasssigalrm
 echo vgdb launched process attached\n
 monitor v.set vgdb-error 999999
 # break on breakme++:
-break passsigalrm.c:48
+break passsigalrm.c:53
 # break on the next line:
-break passsigalrm.c:50
+break passsigalrm.c:55
 #
 #
 # ensure SIGALRM can be passed directly to the process, without
diff --git a/gdbserver_tests/nlpasssigalrm.stdoutB.exp b/gdbserver_tests/nlpasssigalrm.stdoutB.exp
index 64651c25d..7221b0a94 100644
--- a/gdbserver_tests/nlpasssigalrm.stdoutB.exp
+++ b/gdbserver_tests/nlpasssigalrm.stdoutB.exp
@@ -1,5 +1,5 @@
-Breakpoint 1 at 0x........: file passsigalrm.c, line 48.
-Breakpoint 2 at 0x........: file passsigalrm.c, line 50.
+Breakpoint 1 at 0x........: file passsigalrm.c, line 53.
+Breakpoint 2 at 0x........: file passsigalrm.c, line 55.
 Signal        Stop	Print	Pass to program	Description
 SIGALRM       Yes	Yes	Yes		Alarm clock
 Continuing.
@@ -8,12 +8,12 @@ Program received signal SIGALRM, Alarm clock.
 Signal        Stop	Print	Pass to program	Description
 SIGALRM       No	No	Yes		Alarm clock
 Continuing.
-Breakpoint 1, main (argc=1, argv=0x........) at passsigalrm.c:48
-48	   breakme++;
+Breakpoint 1, main (argc=1, argv=0x........) at passsigalrm.c:53
+53	   breakme++;
 $1 = 0
 Continuing.
-Breakpoint 2, main (argc=1, argv=0x........) at passsigalrm.c:50
-50	   sa.sa_handler = sigrtmin_handler;
+Breakpoint 2, main (argc=1, argv=0x........) at passsigalrm.c:55
+55	   sa.sa_handler = sigrtmin_handler;
 $2 = 1
 Continuing.
 Program received signal SIG34, Real-time event 34.
diff --git a/gdbserver_tests/passsigalrm.c b/gdbserver_tests/passsigalrm.c
index f7b5bc290..14f6095e9 100644
--- a/gdbserver_tests/passsigalrm.c
+++ b/gdbserver_tests/passsigalrm.c
@@ -15,6 +15,11 @@ static void sigrtmin_handler(int signr)
 }
 
 static int breakme = 0;
+#ifndef SIGRTMIN
+// at least on MacOS, there is no SIGRTMIN.
+// So, use any other signal instead.
+#define SIGRTMIN SIGUSR1
+#endif
 
 int main (int argc, char *argv[])
 {