diff --git a/lib/main.js b/lib/main.js
index 704a532..8fcdb15 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -26,7 +26,7 @@ var dtype = require( '@stdlib/array-dtype' );
 var contains = require( '@stdlib/array-base-assert-contains' );
 var join = require( '@stdlib/array-base-join' );
 var strided = require( '@stdlib/stats-base-mediansorted' ).ndarray;
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // VARIABLES //
@@ -54,7 +54,7 @@ var GENERIC_DTYPE = 'generic';
 function mediansorted( x ) {
 	var dt;
 	if ( !isCollection( x ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be an array-like object. Value: `%s`.', x ) );
+		throw new TypeError( format( 'null2O', x ) );
 	}
 	dt = dtype( x ) || GENERIC_DTYPE;
 	if ( !contains( IDTYPES, dt ) ) {
diff --git a/package.json b/package.json
index d93a927..a93798d 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "@stdlib/array-dtypes": "^0.3.0",
     "@stdlib/assert-is-collection": "^0.2.2",
     "@stdlib/stats-base-mediansorted": "^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"
   },