diff --git a/src/arr/compiler/compile-structs.arr b/src/arr/compiler/compile-structs.arr
index ca8a85f90b..14435216fb 100644
--- a/src/arr/compiler/compile-structs.arr
+++ b/src/arr/compiler/compile-structs.arr
@@ -2721,6 +2721,7 @@ runtime-provides = provides("builtin://global",
     "num-atan", t-number-unop,
     "num-atan2", t-number-binop,
     "num-modulo", t-number-binop,
+    "num-gcd", t-number-binop,
     "num-remainder", t-number-binop,
     "num-truncate", t-number-unop,
     "num-sqrt", t-number-unop,
diff --git a/src/js/base/runtime.js b/src/js/base/runtime.js
index 2c3e17fa70..c56f33690c 100644
--- a/src/js/base/runtime.js
+++ b/src/js/base/runtime.js
@@ -4964,6 +4964,13 @@ function (Namespace, jsnums, codePoint, util, exnStackParser, loader, seedrandom
       return thisRuntime.makeNumberBig(jsnums.remainder(n, m, NumberErrbacks));
     }
 
+    var num_gcd = function(n, m) {
+      if (arguments.length !== 2) { var $a=new Array(arguments.length); for (var $i=0;$i<arguments.length;$i++) { $a[$i]=arguments[$i]; } throw thisRuntime.ffi.throwArityErrorC(["num-gcd"], 2, $a, false); }
+      thisRuntime.checkArgsInternal2("Numbers", "num-gcd",
+        n, thisRuntime.Number, m, thisRuntime.Number);
+      return thisRuntime.makeNumberBig(jsnums.gcd(n, [m], NumberErrbacks));
+    }
+
     var num_truncate = function(n) {
       if (arguments.length !== 1) { var $a=new Array(arguments.length); for (var $i=0;$i<arguments.length;$i++) { $a[$i]=arguments[$i]; } throw thisRuntime.ffi.throwArityErrorC(["num-truncate"], 1, $a, false); }
       thisRuntime.checkArgsInternal1("Numbers", "num-truncate",
@@ -5597,6 +5604,7 @@ function (Namespace, jsnums, codePoint, util, exnStackParser, loader, seedrandom
       'num-truncate': makeFunction(num_truncate, "num-truncate"),
       'num-sqrt': makeFunction(num_sqrt, "num-sqrt"),
       'num-sqr': makeFunction(num_sqr, "num-sqr"),
+      'num-gcd': makeFunction(num_gcd, "num-gcd"),
       'num-ceiling': makeFunction(num_ceiling, "num-ceiling"),
       'num-floor': makeFunction(num_floor, "num-floor"),
       'num-round': makeFunction(num_round, "num-round"),
diff --git a/src/js/trove/global.js b/src/js/trove/global.js
index 4d554d70d9..b2902ea825 100644
--- a/src/js/trove/global.js
+++ b/src/js/trove/global.js
@@ -223,6 +223,7 @@
       "num-sin":{'bind': 'fun', 'flatness': 0, 'name': 'num-sin', 'typ': 'NumUnop'},
       "num-tan":{'bind': 'fun', 'flatness': 0, 'name': 'num-tan', 'typ': 'NumUnop'},
 
+      "num-gcd":{'bind': 'fun', 'flatness': 0, 'name': 'num-gcd', 'typ': 'NumBinop'},
       "num-modulo":{'bind': 'fun', 'flatness': 0, 'name': 'num-modulo', 'typ': 'NumBinop'},
       "num-remainder":{'bind': 'fun', 'flatness': 0, 'name': 'num-remainder', 'typ': 'NumBinop'},