diff --git a/sys/share/pcmain.c b/sys/share/pcmain.c
index c7d275071..1b38ab951 100644
--- a/sys/share/pcmain.c
+++ b/sys/share/pcmain.c
@@ -343,7 +343,7 @@ _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);*/
             argv++;
 	}
 
-        if (!strncmp(argv[1], "-d", 2) && argv[1][2] != 'e') {
+        if (argc > 1 && !strncmp(argv[1], "-d", 2) && argv[1][2] != 'e') {
             /* avoid matching "-dec" for DECgraphics; since the man page
              * says -d directory, hope nobody's using -desomething_else
              */
diff --git a/sys/unix/unixmain.c b/sys/unix/unixmain.c
index 3c91b3e55..f798fa163 100644
--- a/sys/unix/unixmain.c
+++ b/sys/unix/unixmain.c
@@ -119,7 +119,7 @@ char *argv[];
             argv++;
 	}
 
-        if (!strncmp(argv[1], "-d", 2) && argv[1][2] != 'e') {
+        if (argc > 1 && !strncmp(argv[1], "-d", 2) && argv[1][2] != 'e') {
             /* avoid matching "-dec" for DECgraphics; since the man page
              * says -d directory, hope nobody's using -desomething_else
              */