diff --git a/opencl/api/opencl/khronos/headers/opencl1.2/CL/cl_ext.h b/opencl/api/opencl/khronos/headers/opencl1.2/CL/cl_ext.h
index d3568c4195..8d46a40c58 100644
--- a/opencl/api/opencl/khronos/headers/opencl1.2/CL/cl_ext.h
+++ b/opencl/api/opencl/khronos/headers/opencl1.2/CL/cl_ext.h
@@ -240,7 +240,7 @@ typedef CL_API_ENTRY cl_int (CL_API_CALL *clGetKernelSubGroupInfoKHR_fn)(
 typedef union
 {
     struct { cl_uint type; cl_uint data[5]; } raw;
-    struct { cl_uint type; cl_char unused[17]; cl_char bus; cl_char device; cl_char function; } pcie;
+    struct { cl_uint type; cl_uchar unused[17]; cl_uchar bus; cl_uchar device; cl_uchar function; } pcie;
 } cl_device_topology_amd;
 
 #define CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD            1
diff --git a/opencl/api/opencl/khronos/headers/opencl2.0/CL/cl_ext.h b/opencl/api/opencl/khronos/headers/opencl2.0/CL/cl_ext.h
index 141fbfafc2..fbe756c8d6 100644
--- a/opencl/api/opencl/khronos/headers/opencl2.0/CL/cl_ext.h
+++ b/opencl/api/opencl/khronos/headers/opencl2.0/CL/cl_ext.h
@@ -205,7 +205,7 @@ typedef CL_API_ENTRY cl_int (CL_API_CALL *clTerminateContextKHR_fn)(cl_context /
 typedef union
 {
     struct { cl_uint type; cl_uint data[5]; } raw;
-    struct { cl_uint type; cl_char unused[17]; cl_char bus; cl_char device; cl_char function; } pcie;
+    struct { cl_uint type; cl_uchar unused[17]; cl_uchar bus; cl_uchar device; cl_uchar function; } pcie;
 } cl_device_topology_amd;
 
 #define CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD            1
diff --git a/opencl/api/opencl/khronos/headers/opencl2.1/CL/cl_ext.h b/opencl/api/opencl/khronos/headers/opencl2.1/CL/cl_ext.h
index d67eb72734..139a22d002 100644
--- a/opencl/api/opencl/khronos/headers/opencl2.1/CL/cl_ext.h
+++ b/opencl/api/opencl/khronos/headers/opencl2.1/CL/cl_ext.h
@@ -204,7 +204,7 @@ typedef CL_API_ENTRY cl_int (CL_API_CALL *clTerminateContextKHR_fn)(cl_context /
 typedef union
 {
     struct { cl_uint type; cl_uint data[5]; } raw;
-    struct { cl_uint type; cl_char unused[17]; cl_char bus; cl_char device; cl_char function; } pcie;
+    struct { cl_uint type; cl_uchar unused[17]; cl_uchar bus; cl_uchar device; cl_uchar function; } pcie;
 } cl_device_topology_amd;
 
 #define CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD            1