diff --git a/src/Nazara/OpenGLRenderer/OpenGLShaderStage.cpp b/src/Nazara/OpenGLRenderer/OpenGLShaderStage.cpp
index 561a1d196..b7cc63c9f 100644
--- a/src/Nazara/OpenGLRenderer/OpenGLShaderStage.cpp
+++ b/src/Nazara/OpenGLRenderer/OpenGLShaderStage.cpp
@@ -35,8 +35,7 @@ namespace Nz
 				const auto& contextParams = context.GetParams();
 
 				GlslWriter::Environment env;
-				env.glES = false;
-				//env.glES = (contextParams.type == GL::ContextType::OpenGL_ES);
+				env.glES = (contextParams.type == GL::ContextType::OpenGL_ES);
 				env.glMajorVersion = contextParams.glMajorVersion;
 				env.glMinorVersion = contextParams.glMinorVersion;
 				env.extCallback = [&](const std::string_view& ext)
diff --git a/src/Nazara/Renderer/GlslWriter.cpp b/src/Nazara/Renderer/GlslWriter.cpp
index 9116aa3a3..61dc030da 100644
--- a/src/Nazara/Renderer/GlslWriter.cpp
+++ b/src/Nazara/Renderer/GlslWriter.cpp
@@ -98,6 +98,16 @@ namespace Nz
 			AppendLine();
 		}
 
+		if (m_environment.glES)
+		{
+			AppendLine("#if GL_FRAGMENT_PRECISION_HIGH");
+			AppendLine("precision highp float;");
+			AppendLine("#else");
+			AppendLine("precision mediump float;");
+			AppendLine("#endif");
+			AppendLine();
+		}
+
 		// Global variables (uniforms, input and outputs)
 		const char* inKeyword = (glslVersion >= 130) ? "in" : "varying";
 		const char* outKeyword = (glslVersion >= 130) ? "out" : "varying";