diff --git a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.js b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.js
index 9d88f5b3463a..07607015153b 100644
--- a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.js
+++ b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.js
@@ -24,6 +24,7 @@ var bench = require( '@stdlib/bench' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
 var oneTo = require( '@stdlib/array/one-to' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var dindexOf = require( './../lib/dindex_of.js' );
 
@@ -89,7 +90,7 @@ function main() {
 		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/blas/ext/base/dindex-of/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.native.js
index c4c6d922f1ce..5b26776ab4f6 100644
--- a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.native.js
+++ b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.native.js
@@ -26,6 +26,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
 var oneTo = require( '@stdlib/array/one-to' );
 var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -98,7 +99,7 @@ function main() {
 		len = pow( 10, i );
 
 		f = createBenchmark( len );
-		bench( pkg+'::native:len='+len, opts, f );
+		bench( format( '%s::native:len=%d', pkg, len ), opts, f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.js b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.js
index 3c6067b02002..21190714b1d0 100644
--- a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.js
+++ b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.js
@@ -24,6 +24,7 @@ var bench = require( '@stdlib/bench' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
 var oneTo = require( '@stdlib/array/one-to' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var dindexOf = require( './../lib/ndarray.js' );
 
@@ -89,7 +90,7 @@ function main() {
 		len = pow( 10, i );
 
 		f = createBenchmark( len );
-		bench( pkg+':ndarray:len='+len, f );
+		bench( format( '%s:ndarray:len=%d', pkg, len ), f );
 	}
 }
 
diff --git a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.native.js b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.native.js
index edf66311371c..3a45348802dd 100644
--- a/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.native.js
+++ b/lib/node_modules/@stdlib/blas/ext/base/dindex-of/benchmark/benchmark.ndarray.native.js
@@ -26,6 +26,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
 var oneTo = require( '@stdlib/array/one-to' );
 var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -98,7 +99,7 @@ function main() {
 		len = pow( 10, i );
 
 		f = createBenchmark( len );
-		bench( pkg+'::native:ndarray:len='+len, opts, f );
+		bench( format( '%s::native:ndarray:len=%d', pkg, len ), opts, f );
 	}
 }