--- a/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_openbsd.cpp
+++ b/xpcom/reflect/xptcall/src/md/unix/xptcinvoke_amd64_openbsd.cpp
@@ -167,12 +167,12 @@ NS_InvokeByIndex_P(nsISupports * that, u
         "x" (d0), "x" (d1), "x" (d2), "x" (d3),
         "x" (d4), "x" (d5), "x" (d6), "x" (d7));
     
     // Get pointer to method
     uint64_t methodAddress = *((uint64_t *)that);
     methodAddress += 8 * methodIndex;
     methodAddress = *((uint64_t *)methodAddress);
     
-    typedef uint32_t (*Method)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
-    uint32_t result = ((Method)methodAddress)(a0, a1, a2, a3, a4, a5);
+    typedef nsresult (*Method)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
+    nsresult result = ((Method)methodAddress)(a0, a1, a2, a3, a4, a5);
     return result;
 }