diff --git a/arch/mips/fw/arc/cmdline.c b/arch/mips/fw/arc/cmdline.c
index fd604ef..4ca4eef 100644
--- a/arch/mips/fw/arc/cmdline.c
+++ b/arch/mips/fw/arc/cmdline.c
@@ -52,7 +52,7 @@
 				strcat(cp, used_arc[i][1]);
 				cp += strlen(used_arc[i][1]);
 				/* ... and now the argument */
-				s = strstr(prom_argv(actr), "=");
+				s = strchr(prom_argv(actr), '=');
 				if (s) {
 					s++;
 					strcpy(cp, s);