diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 22b19fb..e2f3cda 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -568,6 +568,13 @@
 				offset += 8;
 			});
 
+			// 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;
+			if (offset >= wasmMinDataAddr) {
+				throw new Error("command line too long");
+			}
+
 			this._inst.exports.run(argc, argv);
 			if (this.exited) {
 				this._resolveExitPromise();
diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go
index 4f0ce23..45e0e08 100644
--- a/src/cmd/link/internal/ld/data.go
+++ b/src/cmd/link/internal/ld/data.go
@@ -2442,6 +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.
+// Keep in sync with wasm_exec.js.
+const wasmMinDataAddr = 4096 + 4096
+
 // address assigns virtual addresses to all segments and sections and
 // returns all segments in file order.
 func (ctxt *Link) address() []*sym.Segment {
@@ -2451,10 +2456,14 @@
 	order = append(order, &Segtext)
 	Segtext.Rwx = 05
 	Segtext.Vaddr = va
-	for _, s := range Segtext.Sections {
+	for i, s := range Segtext.Sections {
 		va = uint64(Rnd(int64(va), int64(s.Align)))
 		s.Vaddr = va
 		va += s.Length
+
+		if ctxt.IsWasm() && i == 0 && va < wasmMinDataAddr {
+			va = wasmMinDataAddr
+		}
 	}
 
 	Segtext.Length = va - uint64(*FlagTextAddr)