diff --git a/rpcs3/Emu/RSX/GL/GLCompute.cpp b/rpcs3/Emu/RSX/GL/GLCompute.cpp
index 74ee1075ec..dd6ba7d276 100644
--- a/rpcs3/Emu/RSX/GL/GLCompute.cpp
+++ b/rpcs3/Emu/RSX/GL/GLCompute.cpp
@@ -21,6 +21,8 @@ namespace gl
 			optimal_group_size = 128;
 		}
 
+		optimal_kernel_size = 256 / optimal_group_size;
+
 		glGetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_COUNT, 0, reinterpret_cast<GLint*>(&max_invocations_x));
 	}