diff --git a/src/zla.zig b/src/zla.zig
index aa89c8c..c637359 100644
--- a/src/zla.zig
+++ b/src/zla.zig
@@ -199,7 +199,7 @@ pub fn pcall(self: *Self, comptime ReturnType: type, nargs: u32) !ReturnType {
         .@"struct" => |s| if (s.is_tuple) @intCast(s.fields.len) else @as(c_int, 1),
         else => 1,
     };
-    if (lua.lua_pcall(self.state, @intCast(nargs), nresults, 0) != 0) {
+    if (@as(i32, lua.lua_pcall(self.state, @intCast(nargs), nresults, 0)) != 0) {
         return self.luaError();
     }
     if (ReturnType == void) return {};