diff --git a/src/gallium/auxiliary/gallivm/lp_bld_nir.c b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
index d451766b9db..a07603d35d0 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_nir.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
@@ -689,12 +689,12 @@ static LLVMValueRef do_alu_action(struct lp_build_nir_context *bld_base,
    case nir_op_fddx:
    case nir_op_fddx_coarse:
    case nir_op_fddx_fine:
-      result = lp_build_ddx(&bld_base->base, src[0]);
+      result = lp_build_ddx(get_flt_bld(bld_base, src_bit_size[0]), src[0]);
       break;
    case nir_op_fddy:
    case nir_op_fddy_coarse:
    case nir_op_fddy_fine:
-      result = lp_build_ddy(&bld_base->base, src[0]);
+      result = lp_build_ddy(get_flt_bld(bld_base, src_bit_size[0]), src[0]);
       break;
    case nir_op_fdiv:
       result = lp_build_div(get_flt_bld(bld_base, src_bit_size[0]),