diff --git a/src/amd/vulkan/radv_formats.c b/src/amd/vulkan/radv_formats.c
index a41c4c8a621..8a07a4c7c9b 100644
--- a/src/amd/vulkan/radv_formats.c
+++ b/src/amd/vulkan/radv_formats.c
@@ -615,7 +615,7 @@ radv_format_pack_clear_color(VkFormat format, uint32_t clear_vals[2], VkClearCol
             else
                f -= 0.5f;
 
-            v = (uint64_t)f;
+            v = (uint64_t)(int64_t)f;
          }
       } else if (channel->type == UTIL_FORMAT_TYPE_FLOAT) {
          if (channel->size == 32) {