diff --git a/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp b/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
index 71d90ff072..2c0546893b 100644
--- a/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
+++ b/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
@@ -984,6 +984,9 @@ std::string GSDeviceOGL::GenGlslHeader(const std::string_view& entry, GLenum typ
 			header += "#extension GL_ARM_shader_framebuffer_fetch : require\n";
 	}
 
+	if (GLLoader::found_GL_ARB_gpu_shader5)
+		header += "#extension GL_ARB_gpu_shader5 : enable\n";
+
 	if (GLLoader::found_GL_ARB_shader_image_load_store)
 	{
 		// Need GL version 420
@@ -1411,14 +1414,11 @@ void GSDeviceOGL::DoFXAA(GSTexture* sTex, GSTexture* dTex)
 	// Lazy compile
 	if (!m_fxaa.ps.IsValid())
 	{
-		if (!GLLoader::found_GL_ARB_gpu_shader5) // GL4.0 extension
-		{
+		// Needs ARB_gpu_shader5 for gather.
+		if (!GLLoader::found_GL_ARB_gpu_shader5)
 			return;
-		}
 
 		std::string fxaa_macro = "#define FXAA_GLSL_130 1\n";
-		fxaa_macro += "#extension GL_ARB_gpu_shader5 : enable\n";
-
 		std::optional<std::string> shader = Host::ReadResourceFileToString("shaders/common/fxaa.fx");
 		if (!shader.has_value())
 			return;