diff --git a/base/at2d/test/test.js b/base/at2d/test/test.js
index d63d8341..70df3eb9 100644
--- a/base/at2d/test/test.js
+++ b/base/at2d/test/test.js
@@ -102,7 +102,7 @@ tape( 'the function returns `undefined` if provided an out-of-bounds index (posi
 	shape = [ 5, 5 ];
 	x = filled2dBy( shape, discreteUniform( 0, 10 ) );
 
-	i0 = incrspace( shape[0], shape[0]+10, 1 );
+	i0 = incrspace( 0, shape[0]+10, 1 );
 	i1 = incrspace( shape[1], shape[1]+10, 1 );
 	indices = nCartesianProduct( i0, i1 );
 
@@ -128,7 +128,7 @@ tape( 'the function returns `undefined` if provided an out-of-bounds index (nega
 	shape = [ 5, 5 ];
 	x = filled2dBy( shape, discreteUniform( 0, 10 ) );
 
-	i0 = incrspace( -shape[0]-10, -shape[0], 1 );
+	i0 = incrspace( -shape[0]-10, 0, 1 );
 	i1 = incrspace( -shape[1]-10, -shape[1], 1 );
 	indices = nCartesianProduct( i0, i1 );
 
diff --git a/base/at3d/test/test.js b/base/at3d/test/test.js
index 60791ab3..a3a23bc8 100644
--- a/base/at3d/test/test.js
+++ b/base/at3d/test/test.js
@@ -107,8 +107,8 @@ tape( 'the function returns `undefined` if provided an out-of-bounds index (posi
 	shape = [ 3, 3, 3 ];
 	x = filled3dBy( shape, discreteUniform( 0, 10 ) );
 
-	i0 = incrspace( shape[0], shape[0]+10, 1 );
-	i1 = incrspace( shape[1], shape[1]+10, 1 );
+	i0 = incrspace( 0, shape[0]+10, 1 );
+	i1 = incrspace( 0, shape[1]+10, 1 );
 	i2 = incrspace( shape[2], shape[2]+10, 1 );
 	indices = nCartesianProduct( i0, i1, i2 );
 
@@ -135,8 +135,8 @@ tape( 'the function returns `undefined` if provided an out-of-bounds index (nega
 	shape = [ 3, 3, 3 ];
 	x = filled3dBy( shape, discreteUniform( 0, 10 ) );
 
-	i0 = incrspace( -shape[0]-10, -shape[0], 1 );
-	i1 = incrspace( -shape[1]-10, -shape[1], 1 );
+	i0 = incrspace( -shape[0]-10, 0, 1 );
+	i1 = incrspace( -shape[1]-10, 0, 1 );
 	i2 = incrspace( -shape[2]-10, -shape[2], 1 );
 	indices = nCartesianProduct( i0, i1, i2 );