diff --git a/src/webgpu/shader/validation/expression/call/builtin/textureSample.spec.ts b/src/webgpu/shader/validation/expression/call/builtin/textureSample.spec.ts
index 11acb7305c77..da79f32deb37 100644
--- a/src/webgpu/shader/validation/expression/call/builtin/textureSample.spec.ts
+++ b/src/webgpu/shader/validation/expression/call/builtin/textureSample.spec.ts
@@ -48,22 +48,26 @@ function innerType(type: string) {
   return type.substring(angleNdx + 1, type.length - (angleNdx >= 0 ? 1 : 0));
 }
 
-// Replace with non-hacky version
-function isConvertible(src: string, dst: string) {
+/** @returns true if an argument of type 'src' can be used for a parameter of type 'dst' */
+function isConvertible(src: Type, dst: Type) {
   if (src === dst) {
     return true;
   }
-  const angleNdx = src.indexOf('<');
-  if (src.substring(0, angleNdx) !== dst.substring(0, angleNdx)) {
+
+  const widthOf = (ty: Type) => {
+    return ty instanceof VectorType ? ty.width : 1;
+  };
+
+  if (widthOf(src) !== widthOf(dst)) {
     return false;
   }
 
-  src = src.substring(angleNdx + 1, src.length - (angleNdx >= 0 ? 1 : 0));
-  dst = dst.substring(angleNdx + 1, dst.length - (angleNdx >= 0 ? 1 : 0));
+  const elSrc = scalarTypeOf(src);
+  const elDst = scalarTypeOf(dst);
 
-  switch (src) {
+  switch (elSrc.kind) {
     case 'abstract-float':
-      switch (dst) {
+      switch (elDst.kind) {
         case 'abstract-float':
         case 'f16':
         case 'f32':
@@ -73,7 +77,7 @@ function isConvertible(src: string, dst: string) {
           return false;
       }
     case 'abstract-int':
-      switch (dst) {
+      switch (elDst.kind) {
         case 'abstract-int':
         case 'abstract-float':
         case 'f16':