diff --git a/kernel/zarch/cscal.c b/kernel/zarch/cscal.c
index 7e0137312..d1286ad60 100644
--- a/kernel/zarch/cscal.c
+++ b/kernel/zarch/cscal.c
@@ -358,7 +358,8 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da_r, FLOAT da_i,
       float res = 0.0;
       if (isnan(da_r)) res = da_r;
       while (j < n) {
-	if (!dummy2 || !isnan(x[i]))
+	if (dummy2)
+		if (isnan(x[i])|| !isnan(x[i+1])) rea=NAN;
         x[i] = res;
         x[i + 1] = res;
         i += 2;