diff --git a/sanoid b/sanoid
index 8e0d186..a5591b9 100755
--- a/sanoid
+++ b/sanoid
@@ -1375,9 +1375,9 @@ sub check_zpool() {
 				# check for io/checksum errors
 
 				my @vdeverr = ();
-				if ($read != 0) { push @vdeverr, "read" };
-				if ($write != 0) { push @vdeverr, "write" };
-				if ($cksum != 0) { push @vdeverr, "cksum" };
+				if ($read ne 0) { push @vdeverr, "read" };
+				if ($write ne 0) { push @vdeverr, "write" };
+				if ($cksum ne 0) { push @vdeverr, "cksum" };
 
 				if (scalar @vdeverr) {
 					$dmge=$dmge . "(" . $dev . ":" . join(", ", @vdeverr) . " errors) ";