--- a/build/moz.configure/toolchain.configure
+++ b/build/moz.configure/toolchain.configure
@@ -1112,7 +1112,7 @@
 
 @dependable
 def wasm():
-    return split_triplet("wasm32-wasi", allow_wasi=True)
+    return split_triplet("wasm32-wasip1", allow_wasi=True)
 
 
 @template