diff --git a/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.js b/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.js
index 74cea341be21..249b974b34b5 100644
--- a/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.js
@@ -24,6 +24,7 @@ var bench = require( '@stdlib/bench' );
 var uniform = require( '@stdlib/random/array/uniform' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var spttrf = require( './../lib/spttrf.js' );
 
@@ -96,7 +97,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+		bench( format( '%s:len=%d', pkg, len ), f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.ndarray.js b/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.ndarray.js
index 550807e3251e..24f9534238aa 100644
--- a/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.ndarray.js
+++ b/lib/node_modules/@stdlib/lapack/base/spttrf/benchmark/benchmark.ndarray.js
@@ -24,6 +24,7 @@ var bench = require( '@stdlib/bench' );
 var uniform = require( '@stdlib/random/array/uniform' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var pow = require( '@stdlib/math/base/special/pow' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var spttrf = require( './../lib/ndarray.js' );
 
@@ -96,7 +97,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':ndarray:len='+len, f );
+		bench( format( '%s:ndarray:len=%d', pkg, len ), f );
 	}
 }