diff --git a/naga/src/valid/expression.rs b/naga/src/valid/expression.rs
index 39c1ab7490..0b0d115c57 100644
--- a/naga/src/valid/expression.rs
+++ b/naga/src/valid/expression.rs
@@ -1161,7 +1161,7 @@ impl super::Validator {
                             ));
                         }
                     }
-                    Mf::Outer | Mf::Cross | Mf::Reflect => {
+                    Mf::Outer | Mf::Reflect => {
                         let arg1_ty = match (arg1_ty, arg2_ty, arg3_ty) {
                             (Some(ty1), None, None) => ty1,
                             _ => return Err(ExpressionError::WrongArgumentCount(fun)),
@@ -1172,8 +1172,31 @@ impl super::Validator {
                                     Sc {
                                         kind: Sk::Float, ..
                                     },
-                                size: vector_size,
-                            } if fun != Mf::Cross || vector_size == crate::VectorSize::Tri => {}
+                                ..
+                            } => {}
+                            _ => return Err(ExpressionError::InvalidArgumentType(fun, 0, arg)),
+                        }
+                        if arg1_ty != arg_ty {
+                            return Err(ExpressionError::InvalidArgumentType(
+                                fun,
+                                1,
+                                arg1.unwrap(),
+                            ));
+                        }
+                    }
+                    Mf::Cross => {
+                        let arg1_ty = match (arg1_ty, arg2_ty, arg3_ty) {
+                            (Some(ty1), None, None) => ty1,
+                            _ => return Err(ExpressionError::WrongArgumentCount(fun)),
+                        };
+                        match *arg_ty {
+                            Ti::Vector {
+                                scalar:
+                                    Sc {
+                                        kind: Sk::Float, ..
+                                    },
+                                size: crate::VectorSize::Tri,
+                            } => {}
                             _ => return Err(ExpressionError::InvalidArgumentType(fun, 0, arg)),
                         }
                         if arg1_ty != arg_ty {