diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index 5e6fff6fbb0..455585adc3c 100644
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,3 +1,8 @@
+2011-06-09  Joel Brobecker  <brobecker@adacore.com>
+
+	* psim.c (psim_options): Fix length of comparison when checking
+	for --sysroot= option.
+
 2011-06-08  Joel Brobecker  <brobecker@adacore.com>
 
 	* psim.c (psim_options): Add option that cause the error
diff --git a/sim/ppc/psim.c b/sim/ppc/psim.c
index d814486be33..3e7638690a1 100644
--- a/sim/ppc/psim.c
+++ b/sim/ppc/psim.c
@@ -359,7 +359,7 @@ psim_options(device *root,
 	else if (strcmp (argv[argp], "--help") == 0)
 	  psim_usage (0, 1);
 	else if (strncmp (argv[argp], "--sysroot=",
-			  sizeof ("--sysroot=")) == 0)
+			  sizeof ("--sysroot=") - 1) == 0)
 	  /* Ignore this option.  */
 	  p = argv[argp] + strlen(argv[argp]) - 1;
 	else if (strcmp (argv[argp], "--version") == 0)