diff --git a/base/idamax/test/test.ndarray.js b/base/idamax/test/test.ndarray.js
index d7dc5d136..6a53cb7a0 100644
--- a/base/idamax/test/test.ndarray.js
+++ b/base/idamax/test/test.ndarray.js
@@ -108,7 +108,7 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns `0`', fun
 	t.end();
 });
 
-tape( 'if provided a `strideX` parameter less than or equal to `0`, the function returns `0`', function test( t ) {
+tape( 'if provided a `strideX` parameter less than or equal to `0`, the function returns `-1`', function test( t ) {
 	var expected;
 	var idx;
 	var x;
diff --git a/base/idamax/test/test.ndarray.native.js b/base/idamax/test/test.ndarray.native.js
index 96953e880..320ed6b0e 100644
--- a/base/idamax/test/test.ndarray.native.js
+++ b/base/idamax/test/test.ndarray.native.js
@@ -117,7 +117,7 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns `0`', opt
 	t.end();
 });
 
-tape( 'if provided a `strideX` parameter less than or equal to `0`, the function returns `0`', opts, function test( t ) {
+tape( 'if provided a `strideX` parameter less than or equal to `0`, the function returns `-1`', opts, function test( t ) {
 	var expected;
 	var idx;
 	var x;