diff --git a/src/runtime_debug.js b/src/runtime_debug.js
index 33d0e1c632ed..0ade98dba7a6 100644
--- a/src/runtime_debug.js
+++ b/src/runtime_debug.js
@@ -45,7 +45,7 @@ function missingGlobal(sym, msg) {
     Object.defineProperty(globalThis, sym, {
       configurable: true,
       get() {
-        warnOnce('`' + sym + '` is not longer defined by emscripten. ' + msg);
+        warnOnce(`\`${sym}\` is not longer defined by emscripten. ${msg}`);
         return undefined;
       }
     });
@@ -62,7 +62,7 @@ function missingLibrarySymbol(sym) {
       get() {
         // Can't `abort()` here because it would break code that does runtime
         // checks.  e.g. `if (typeof SDL === 'undefined')`.
-        var msg = '`' + sym + '` is a library symbol and not included by default; add it to your library.js __deps or to DEFAULT_LIBRARY_FUNCS_TO_INCLUDE on the command line';
+        var msg = `\`${sym}\` is a library symbol and not included by default; add it to your library.js __deps or to DEFAULT_LIBRARY_FUNCS_TO_INCLUDE on the command line`;
         // DEFAULT_LIBRARY_FUNCS_TO_INCLUDE requires the name as it appears in
         // library.js, which means $name for a JS name with no prefix, or name
         // for a JS name like _name.
@@ -70,7 +70,7 @@ function missingLibrarySymbol(sym) {
         if (!librarySymbol.startsWith('_')) {
           librarySymbol = '$' + sym;
         }
-        msg += " (e.g. -sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE='" + librarySymbol + "')";
+        msg += ` (e.g. -sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE='${librarySymbol}')`;
         if (isExportedByForceFilesystem(sym)) {
           msg += '. Alternatively, forcing filesystem support (-sFORCE_FILESYSTEM) can export this for you';
         }
@@ -89,7 +89,7 @@ function unexportedRuntimeSymbol(sym) {
     Object.defineProperty(Module, sym, {
       configurable: true,
       get() {
-        var msg = "'" + sym + "' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the Emscripten FAQ)";
+        var msg = `'${sym}' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the Emscripten FAQ)`;
         if (isExportedByForceFilesystem(sym)) {
           msg += '. Alternatively, forcing filesystem support (-sFORCE_FILESYSTEM) can export this for you';
         }
@@ -114,9 +114,9 @@ var MIN_INT53 = - (2 ** (53 - 1)) + 1;
 var MIN_INT64 = - (2 ** (64 - 1)) + 1;
 
 function checkInt(value, bits, min, max) {
-  assert(Number.isInteger(Number(value)), "attempt to write non-integer (" + value + ") into integer heap");
-  assert(value <= max, "value (" + value + ") too large to write as " + bits +"-bit value");
-  assert(value >= min, "value (" + value + ") too small to write as " + bits +"-bit value");
+  assert(Number.isInteger(Number(value)), `attempt to write non-integer (${value}) into integer heap`);
+  assert(value <= max, `value (${value}) too large to write as ${bits}-bit value`);
+  assert(value >= min, `value (${value}) too small to write as ${bits}-bit value`);
 }
 
 var checkInt1 = (value) => checkInt(value, 1, 1);