diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index affbae3e..8dd6df0f 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -7060,6 +7060,7 @@ enum vkd3d_result vsir_program_validate(struct vsir_program *program, uint64_t c
         .null_location = {.source_name = source_name},
         .status = VKD3D_OK,
         .phase = VKD3DSIH_INVALID,
+        .invalid_instruction_idx = true,
     };
     unsigned int i;
 
@@ -7088,6 +7089,8 @@ enum vkd3d_result vsir_program_validate(struct vsir_program *program, uint64_t c
     if (!(ctx.ssas = vkd3d_calloc(ctx.program->ssa_count, sizeof(*ctx.ssas))))
         goto fail;
 
+    ctx.invalid_instruction_idx = false;
+
     for (ctx.instruction_idx = 0; ctx.instruction_idx < program->instructions.count
             && ctx.status != VKD3D_ERROR_OUT_OF_MEMORY; ++ctx.instruction_idx)
         vsir_validate_instruction(&ctx);