diff --git a/main/main.cpp b/main/main.cpp
index ac23086f362..2a08b03b967 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -1543,6 +1543,11 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	if (default_renderer_mobile.is_empty()) {
 		default_renderer_mobile = "gl_compatibility";
 	}
+	// Default to Compatibility when using the project manager.
+	if (rendering_driver.is_empty() && rendering_method.is_empty() && project_manager) {
+		rendering_driver = "opengl3";
+		rendering_method = "gl_compatibility";
+	}
 #endif
 	if (renderer_hints.is_empty()) {
 		ERR_PRINT("No renderers available.");