diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 30044a6..9ce6a20 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -519,9 +519,9 @@
 
 			// The linker guarantees global data starts from at least wasmMinDataAddr.
 			// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
-			const wasmMinDataAddr = 4096 + 4096;
+			const wasmMinDataAddr = 4096 + 8192;
 			if (offset >= wasmMinDataAddr) {
-				throw new Error("command line too long");
+				throw new Error("total length of command line and environment variables exceeds limit");
 			}
 
 			this._inst.exports.run(argc, argv);
diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go
index 45e0e08..0513a0d 100644
--- a/src/cmd/link/internal/ld/data.go
+++ b/src/cmd/link/internal/ld/data.go
@@ -2442,10 +2442,11 @@
 	return (ctxt.IsPPC64() || (ctxt.IsARM64() && ctxt.IsDarwin())) && ctxt.IsExternal()
 }
 
-// On Wasm, we reserve 4096 bytes for zero page, then 4096 bytes for wasm_exec.js
-// to store command line args. Data sections starts from at least address 8192.
+// On Wasm, we reserve 4096 bytes for zero page, then 8192 bytes for wasm_exec.js
+// to store command line args and environment variables.
+// Data sections starts from at least address 12288.
 // Keep in sync with wasm_exec.js.
-const wasmMinDataAddr = 4096 + 4096
+const wasmMinDataAddr = 4096 + 8192
 
 // address assigns virtual addresses to all segments and sections and
 // returns all segments in file order.