diff --git a/libc/utils/gpu/loader/amdgpu/amdhsa-loader.cpp b/libc/utils/gpu/loader/amdgpu/amdhsa-loader.cpp
index 1beef8170475a..f6ce598cd7102 100644
--- a/libc/utils/gpu/loader/amdgpu/amdhsa-loader.cpp
+++ b/libc/utils/gpu/loader/amdgpu/amdhsa-loader.cpp
@@ -281,6 +281,7 @@ hsa_status_t launch_kernel(hsa_agent_t dev_agent, hsa_executable_t executable,
   // Initialize the packet header and set the doorbell signal to begin execution
   // by the HSA runtime.
   uint16_t header =
+      1u << HSA_PACKET_HEADER_BARRIER |
       (HSA_PACKET_TYPE_KERNEL_DISPATCH << HSA_PACKET_HEADER_TYPE) |
       (HSA_FENCE_SCOPE_SYSTEM << HSA_PACKET_HEADER_SCACQUIRE_FENCE_SCOPE) |
       (HSA_FENCE_SCOPE_SYSTEM << HSA_PACKET_HEADER_SCRELEASE_FENCE_SCOPE);
@@ -540,11 +541,11 @@ int load(int argc, const char **argv, const char **envp, void *image,
     }
   }
 
-  // Obtain a queue with the minimum (power of two) size, used to send commands
+  // Obtain a queue with the maximum (power of two) size, used to send commands
   // to the HSA runtime and launch execution on the device.
   uint64_t queue_size;
   if (hsa_status_t err = hsa_agent_get_info(
-          dev_agent, HSA_AGENT_INFO_QUEUE_MIN_SIZE, &queue_size))
+          dev_agent, HSA_AGENT_INFO_QUEUE_MAX_SIZE, &queue_size))
     handle_error(err);
   hsa_queue_t *queue = nullptr;
   if (hsa_status_t err =