diff --git a/lib/main.js b/lib/main.js
index a792bff..c1a4fa9 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -22,7 +22,7 @@
 
 var isNonNegativeInteger = require( '@stdlib/assert-is-nonnegative-integer' ).isPrimitive;
 var isCollection = require( '@stdlib/assert-is-collection' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // MAIN //
@@ -48,18 +48,18 @@ function shape( x ) {
 
 	// Note: we intentionally avoid rigorous ndarray checks to minimize performance impacts. This obviously means that non-ndarray-like objects can sneak through, but this is likely all right for the purposes of this function...
 	if ( typeof x !== 'object' || x === null ) {
-		throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
+		throw new TypeError( format( '1kBDv', x ) );
 	}
 	sh = x.shape;
 	if ( !isCollection( sh ) ) {
-		throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
+		throw new TypeError( format( '1kBDv', x ) );
 	}
 	// Copy the shape in order to avoid unintended mutation...
 	out = [];
 	for ( i = 0; i < sh.length; i++ ) {
 		d = sh[ i ];
 		if ( !isNonNegativeInteger( d ) ) {
-			throw new TypeError( format( 'invalid argument. Must provide an ndarray. Value: `%s`.', x ) );
+			throw new TypeError( format( '1kBDv', x ) );
 		}
 		out.push( d );
 	}
diff --git a/package.json b/package.json
index 91d6ad2..1d9c837 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   "dependencies": {
     "@stdlib/assert-is-collection": "^0.2.2",
     "@stdlib/assert-is-nonnegative-integer": "^0.2.2",
-    "@stdlib/string-format": "^0.2.2",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.2",
     "@stdlib/types": "^0.4.3",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.2"
   },