diff --git a/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.assign.js b/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.assign.js
index baa11a25a030..0b14b1c60bb8 100644
--- a/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.assign.js
+++ b/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.assign.js
@@ -23,6 +23,7 @@
 var bench = require( '@stdlib/bench' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
 var uniform = require( '@stdlib/random/array/uniform' );
 var zeros = require( '@stdlib/ndarray/zeros' );
 var ndarray = require( '@stdlib/ndarray/base/ctor' );
@@ -117,7 +118,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':assign:dtype='+options.dtype+',len='+len, f );
+		bench( format( '%s:assign:dtype=%s,len=%d', pkg, options.dtype, len ), f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.js
index 8e24fe67f117..fad8270c6342 100644
--- a/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/blas/ext/find-last-index/benchmark/benchmark.js
@@ -23,6 +23,7 @@
 var bench = require( '@stdlib/bench' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
 var uniform = require( '@stdlib/random/array/uniform' );
 var ndarray = require( '@stdlib/ndarray/base/ctor' );
 var pkg = require( './../package.json' ).name;
@@ -109,7 +110,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':dtype='+options.dtype+',len='+len, f );
+		bench( format( '%s:dtype=%s,len=%d', pkg, options.dtype, len ), f );
 	}
 }