diff --git a/js/web/lib/wasm/jsep/webgpu/ops/cumsum.ts b/js/web/lib/wasm/jsep/webgpu/ops/cumsum.ts
index e7208ce34d..85682f0b47 100644
--- a/js/web/lib/wasm/jsep/webgpu/ops/cumsum.ts
+++ b/js/web/lib/wasm/jsep/webgpu/ops/cumsum.ts
@@ -37,7 +37,7 @@ const createCumsumProgramInfo =
                 ${shaderHelper.mainStart()}
                   ${shaderHelper.guardAgainstOutOfBoundsWorkgroupSizes('uniforms.outputSize')}
                   var inputIndices = ${output.offsetToIndices('global_idx')};
-                  var sum = 0.0;
+                  var sum = ${output.type.value}(0);
                   let first : i32 = ${lowerLimit};
                   let last : i32 = ${upperLimit};
                   for (var i : i32 = first; i < last; i++) {
diff --git a/js/web/test/data/ops/cumsum.jsonc b/js/web/test/data/ops/cumsum.jsonc
index cac9be734b..b3173afb69 100644
--- a/js/web/test/data/ops/cumsum.jsonc
+++ b/js/web/test/data/ops/cumsum.jsonc
@@ -1322,5 +1322,41 @@
         ]
       }
     ]
+  },
+  {
+    "name": "CumSum",
+    "operator": "CumSum",
+    "attributes": [
+      { "name": "exclusive", "data": 0, "type": "int" },
+      { "name": "reverse", "data": 0, "type": "int" }
+    ],
+    "opset": {
+      "domain": "",
+      "version": 11
+    },
+    "cases": [
+      {
+        "name": "CumSum int32; axis = 0; exclusive = 0, reverse = 0",
+        "inputs": [
+          {
+            "data": [1, 2, 3, 4, 5],
+            "dims": [1, 1, 1, 1, 5],
+            "type": "int32"
+          },
+          {
+            "data": [4],
+            "dims": [],
+            "type": "int32"
+          }
+        ],
+        "outputs": [
+          {
+            "data": [1, 3, 6, 10, 15],
+            "dims": [1, 1, 1, 1, 5],
+            "type": "int32"
+          }
+        ]
+      }
+    ]
   }
 ]