diff --git a/lib/handlebars/compiler/javascript-compiler.js b/lib/handlebars/compiler/javascript-compiler.js
index 6e7a0c12c..ef3fa71a5 100644
--- a/lib/handlebars/compiler/javascript-compiler.js
+++ b/lib/handlebars/compiler/javascript-compiler.js
@@ -426,7 +426,10 @@ JavaScriptCompiler.prototype = {
   // Otherwise, the empty string is appended
   append: function () {
     if (this.isInline()) {
-      this.replaceStack((current) => [' != null ? ', current, ' : ""']);
+      // Coerce non-null values to a String so that adjacent buffer appends are
+      // concatenated rather than combined by the merge `+` (e.g. numeric values
+      // such as `{{a}}{{b}}` with `noEscape` must yield "12", not 3).
+      this.replaceStack((current) => [' != null ? "" + ', current, ' : ""']);
 
       this.pushSource(this.appendToBuffer(this.popStack()));
     } else {
diff --git a/spec/basic.js b/spec/basic.js
index f3d37e250..9809148d3 100644
--- a/spec/basic.js
+++ b/spec/basic.js
@@ -111,6 +111,22 @@ describe('basic context', function () {
       .toCompileTo('num: 0');
   });
 
+  it('does not add adjacent numeric values with noEscape or raw mustaches', function () {
+    expectTemplate('{{a}}{{b}}')
+      .withCompileOptions({ noEscape: true })
+      .withInput({ a: 1, b: 2 })
+      .toCompileTo('12');
+
+    expectTemplate('{{a}}{{b}}{{c}}')
+      .withCompileOptions({ noEscape: true })
+      .withInput({ a: 1, b: 2, c: 3 })
+      .toCompileTo('123');
+
+    expectTemplate('{{{a}}}{{{b}}}')
+      .withInput({ a: 1, b: 2 })
+      .toCompileTo('12');
+  });
+
   it('false', function () {
     /* eslint-disable no-new-wrappers */
     expectTemplate('val1: {{val1}}, val2: {{val2}}')