diff --git a/drivers/gles3/shader_gles3.cpp b/drivers/gles3/shader_gles3.cpp
index d781f3dd031..2aae6c11161 100644
--- a/drivers/gles3/shader_gles3.cpp
+++ b/drivers/gles3/shader_gles3.cpp
@@ -242,7 +242,8 @@ bool ShaderGLES3::_process_program_state(Version *p_version, bool p_async_forbid
 			case Version::COMPILE_STATUS_SOURCE_PROVIDED: {
 				uint32_t start_compiles_count = p_async_forbidden ? 2 : 0;
 				if (!start_compiles_count) {
-					uint32_t free_async_slots = MAX(0, MIN(max_simultaneous_compiles - active_compiles_count, max_simultaneous_compiles - *compiles_started_this_frame));
+					uint32_t used_async_slots = MAX(active_compiles_count, *compiles_started_this_frame);
+					uint32_t free_async_slots = used_async_slots < active_compiles_count ? active_compiles_count - used_async_slots : 0;
 					start_compiles_count = MIN(2, free_async_slots);
 				}
 				if (start_compiles_count >= 1) {