diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index ffc3767c98e..cb5f99f3fb2 100644
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -4079,8 +4079,10 @@ vtn_handle_composite(struct vtn_builder *b, SpvOp opcode,
       assume(elems >= 1);
       if (glsl_type_is_vector_or_scalar(type->type)) {
          nir_ssa_def *srcs[NIR_MAX_VEC_COMPONENTS];
-         for (unsigned i = 0; i < elems; i++)
+         for (unsigned i = 0; i < elems; i++) {
             srcs[i] = vtn_get_nir_ssa(b, w[3 + i]);
+            vtn_assert(glsl_get_bit_size(type->type) == srcs[i]->bit_size);
+         }
          ssa->def =
             vtn_vector_construct(b, glsl_get_vector_elements(type->type),
                                  elems, srcs);