diff --git a/libs/vkd3d-shader/spirv.c b/libs/vkd3d-shader/spirv.c
index bc190e2d..9847dd81 100644
--- a/libs/vkd3d-shader/spirv.c
+++ b/libs/vkd3d-shader/spirv.c
@@ -7874,7 +7874,7 @@ static void vkd3d_dxbc_compiler_emit_sample(struct vkd3d_dxbc_compiler *compiler
     unsigned int image_operand_count = 0;
     struct vkd3d_shader_image image;
     unsigned int num_coordinates;
-    uint32_t image_operands[3];
+    uint32_t image_operands[4];
     DWORD coordinate_mask;
     bool is_sparse_op;
     SpvOp op;