diff --git a/tools/clang/lib/Sema/SemaHLSL.cpp b/tools/clang/lib/Sema/SemaHLSL.cpp
index 2b3f065d71..5419863872 100644
--- a/tools/clang/lib/Sema/SemaHLSL.cpp
+++ b/tools/clang/lib/Sema/SemaHLSL.cpp
@@ -9901,6 +9901,7 @@ bool HLSLExternalSource::CanConvert(SourceLocation loc, Expr *sourceExpr,
       // We can only splat to target types that do not contain object/resource
       // types
       if (sourceSingleElementBuiltinType != nullptr &&
+          !m_sema->RequireCompleteType(loc, target, 0) &&
           hlsl::IsHLSLNumericOrAggregateOfNumericType(target)) {
         BuiltinType::Kind kind = sourceSingleElementBuiltinType->getKind();
         switch (kind) {
diff --git a/tools/clang/test/CodeGenDXIL/templates/incomplete-target-in-CanConvert.hlsl b/tools/clang/test/CodeGenDXIL/templates/incomplete-target-in-CanConvert.hlsl
new file mode 100644
index 0000000000..bd559d2ed1
--- /dev/null
+++ b/tools/clang/test/CodeGenDXIL/templates/incomplete-target-in-CanConvert.hlsl
@@ -0,0 +1,39 @@
+// RUN: %dxc -T vs_6_0 -E main %s | FileCheck %s
+
+// CHECK: %[[IN:[^ ]+]] = call float @dx.op.loadInput.f32(i32 4, i32 0, i32 0, i8 0, i32 undef)
+// CHECK: call void @dx.op.storeOutput.f32(i32 5, i32 0, i32 0, i8 0, float %[[IN]])
+
+template<typename T> struct Wrapper;
+float get(float x) { return x;}
+float get(Wrapper<float> o);
+
+template<typename T> struct Wrapper2;
+float get(Wrapper2<float> o);
+
+template<typename T>
+struct Wrapper {
+    T value;
+    void set(float x) {
+      // Incomplete target in CanConvert triggered during check whether explicit
+      // cast would be allowed for converting to overload candidate 'float
+      // get(Wrapper<float>)'.  CanConvert would check spat potential when
+      // explicit and source is a basic numeric type.  This would cause crash in
+      // IsHLSLCopyableAnnotatableRecord from the incomplete type.
+      // Here, we can complete the type: Wrapper<float>, but not Wrapper2<float>
+      value = get(x);
+    }
+};
+
+float get(Wrapper<float> o) { return o.value; }
+
+template<typename T>
+struct Wrapper2 : Wrapper<T> {
+};
+
+float get(Wrapper2<float> o) { return o.value; }
+
+float main(float x : IN) : OUT {
+    Wrapper2<float> w;
+    w.set(x);
+    return get(w);
+}