diff --git a/src/os_unix.c b/src/os_unix.c
index 0b2b572..fa9c5f3 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6691,10 +6691,17 @@
     }
     else
     {
-	if (flags & EW_NOTFOUND)
-	    STRCPY(command, "set nonomatch; ");
-	else
-	    STRCPY(command, "unset nonomatch; ");
+	STRCPY(command, "");
+	if (shell_style == STYLE_GLOB)
+	{
+	    // Assume the nonomatch option is valid only for csh like shells,
+	    // otherwise, this may set the positional parameters for the shell,
+	    // e.g. "$*".
+	    if (flags & EW_NOTFOUND)
+		STRCAT(command, "set nonomatch; ");
+	    else
+		STRCAT(command, "unset nonomatch; ");
+	}
 	if (shell_style == STYLE_GLOB)
 	    STRCAT(command, "glob >");
 	else if (shell_style == STYLE_PRINT)