diff --git a/lib/gpu/geryon/ocl_kernel.h b/lib/gpu/geryon/ocl_kernel.h
index 8b8807f153..d78bf8e2fa 100644
--- a/lib/gpu/geryon/ocl_kernel.h
+++ b/lib/gpu/geryon/ocl_kernel.h
@@ -85,6 +85,8 @@ class UCL_Program {
     _program=clCreateProgramWithSource(_context,1,&prog,NULL,&error_flag);
     CL_CHECK_ERR(error_flag);
     error_flag = clBuildProgram(_program,1,&_device,flags,NULL,NULL);
+    if (error_flag!=-11)
+      CL_CHECK_ERR(error_flag);
     cl_build_status build_status;
     CL_SAFE_CALL(clGetProgramBuildInfo(_program,_device,
                                        CL_PROGRAM_BUILD_STATUS, 
@@ -106,7 +108,8 @@ class UCL_Program {
         #ifndef UCL_NO_EXIT                                                 
         std::cerr << std::endl
                   << "----------------------------------------------------------\n"
-                  << " UCL Error: Error compiling OpenCL Program...\n"
+                  << " UCL Error: Error compiling OpenCL Program ("
+                  << build_status << ") ...\n"
                   << "----------------------------------------------------------\n";
         std::cerr << build_log << std::endl;
         #endif
diff --git a/lib/gpu/pppm.cpp b/lib/gpu/pppm.cpp
index bedef67403..c618df848e 100644
--- a/lib/gpu/pppm.cpp
+++ b/lib/gpu/pppm.cpp
@@ -378,7 +378,7 @@ void PPPMT::compile_kernels(UCL_Device &dev) {
   std::string flags="-cl-fast-relaxed-math -cl-mad-enable "+
                     std::string(OCL_PRECISION_COMPILE);
   #ifdef USE_OPENCL
-  flags+=std::string(" -D grdtyp=")+ucl_template_name<grdtyp>()+" -D grdtyp4="+
+  flags+=std::string(" -Dgrdtyp=")+ucl_template_name<grdtyp>()+" -Dgrdtyp4="+
          ucl_template_name<grdtyp>()+"4";
   #endif