diff --git a/lib/main.js b/lib/main.js
index b527308..65dbc8f 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -24,7 +24,7 @@ var iterationOrder = require( '@stdlib/ndarray-base-iteration-order' );
 var strides2order = require( '@stdlib/ndarray-base-strides2order' );
 var minmaxViewBufferIndex = require( '@stdlib/ndarray-base-minmax-view-buffer-index' );
 var ndarray2object = require( '@stdlib/ndarray-base-ndarraylike2object' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 var blockedaccessorunary2d = require( './2d_blocked_accessors.js' );
 var blockedaccessorunary3d = require( './3d_blocked_accessors.js' );
 var blockedaccessorunary4d = require( './4d_blocked_accessors.js' );
@@ -234,7 +234,7 @@ function unary( arrays, fcn ) {
 	for ( i = 0; i < ndims; i++ ) {
 		d = shx[ i ];
 		if ( d !== shy[ i ] ) {
-			throw new Error( 'invalid arguments. Arrays must have the same shape.' );
+			throw new Error( format('0jd0d') );
 		}
 		// Note that, if one of the dimensions is `0`, the length will be `0`...
 		len *= d;
diff --git a/package.json b/package.json
index d678808..3e1aa1f 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "@stdlib/ndarray-ctor": "^0.2.2",
     "@stdlib/ndarray-index-modes": "^0.2.2",
     "@stdlib/ndarray-orders": "^0.2.2",
-    "@stdlib/string-format": "^0.2.2",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.2",
     "@stdlib/types": "^0.4.3",
     "@stdlib/utils-library-manifest": "^0.2.2",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.2"