diff --git a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
index dcf9591e0af..a0a93abb1fe 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
@@ -2057,6 +2057,12 @@ emit_alu(struct ntv_context *ctx, nir_alu_instr *alu)
    UNOP(nir_op_bit_count, SpvOpBitCount)
 #undef UNOP
 
+   case nir_op_f2f16_rtz:
+      assert(nir_op_infos[alu->op].num_inputs == 1);
+      result = emit_unop(ctx, SpvOpFConvert, dest_type, src[0]);
+      spirv_builder_emit_rounding_mode(&ctx->builder, result, SpvFPRoundingModeRTZ);
+      break;
+
    case nir_op_inot:
       if (bit_size == 1)
          result = emit_unop(ctx, SpvOpLogicalNot, dest_type, src[0]);
diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
index 5446016be64..0108826589d 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.c
@@ -216,6 +216,14 @@ spirv_builder_emit_decoration(struct spirv_builder *b, SpvId target,
    emit_decoration(b, target, decoration, NULL, 0);
 }
 
+void
+spirv_builder_emit_rounding_mode(struct spirv_builder *b, SpvId target,
+                                 SpvFPRoundingMode rounding)
+{
+   uint32_t args[] = { rounding };
+   emit_decoration(b, target, SpvDecorationFPRoundingMode, args, ARRAY_SIZE(args));
+}
+
 void
 spirv_builder_emit_input_attachment_index(struct spirv_builder *b, SpvId target, uint32_t id)
 {
diff --git a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
index c3233a0030d..db7c64f17d0 100644
--- a/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
+++ b/src/gallium/drivers/zink/nir_to_spirv/spirv_builder.h
@@ -89,6 +89,10 @@ void
 spirv_builder_emit_decoration(struct spirv_builder *b, SpvId target,
                               SpvDecoration decoration);
 
+void
+spirv_builder_emit_rounding_mode(struct spirv_builder *b, SpvId target,
+                                 SpvFPRoundingMode rounding);
+
 void
 spirv_builder_emit_input_attachment_index(struct spirv_builder *b, SpvId target, uint32_t id);