diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 846c4948fcfd..da2703c04474 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -121,7 +121,7 @@ static int ffa_version_check(u32 *version)
 		      .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
 		      }, &ver);
 
-	if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
+	if ((s32)ver.a0 == FFA_RET_NOT_SUPPORTED) {
 		pr_info("FFA_VERSION returned not supported\n");
 		return -EOPNOTSUPP;
 	}