diff --git a/filament/backend/src/opengl/OpenGLDriver.cpp b/filament/backend/src/opengl/OpenGLDriver.cpp
index 27e6b501d6..b0c625853b 100644
--- a/filament/backend/src/opengl/OpenGLDriver.cpp
+++ b/filament/backend/src/opengl/OpenGLDriver.cpp
@@ -823,7 +823,7 @@ void OpenGLDriver::framebufferTexture(backend::TargetBufferInfo const& binfo,
             }
             CHECK_GL_ERROR(utils::slog.e)
         } else
-#if GLES30_HEADERS
+#ifdef GL_EXT_multisampled_render_to_texture
             if (gl.ext.EXT_multisampled_render_to_texture && t->depth <= 1) {
                 assert(rt->gl.samples > 1);
                 // We have a multi-sample rendertarget and we have EXT_multisampled_render_to_texture,
diff --git a/filament/backend/src/opengl/gl_headers.h b/filament/backend/src/opengl/gl_headers.h
index 16fb13aa35..7eef4038b8 100644
--- a/filament/backend/src/opengl/gl_headers.h
+++ b/filament/backend/src/opengl/gl_headers.h
@@ -40,7 +40,7 @@
         extern PFNGLPUSHGROUPMARKEREXTPROC glPushGroupMarkerEXT;
         extern PFNGLPOPGROUPMARKEREXTPROC glPopGroupMarkerEXT;
 #endif
-#if GL_EXT_multisampled_render_to_texture
+#ifdef GL_EXT_multisampled_render_to_texture
         extern PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC glRenderbufferStorageMultisampleEXT;
         extern PFNGLFRAMEBUFFERTEXTURE2DMULTISAMPLEEXTPROC glFramebufferTexture2DMultisampleEXT;
 #endif
@@ -83,11 +83,16 @@
     #include <OpenGLES/ES3/glext.h>
 
     /* The iOS SDK only provides OpenGL ES headers up to 3.0. Filament works with OpenGL 3.0, but
-     * requires the following 3.1 define in order to compile. */
+     * requires the following 3.1 declarations in order to compile. */
 
     #define GL_TEXTURE_2D_MULTISAMPLE         0x9100
     #define GL_TIME_ELAPSED                   0x88BF
 
+#ifdef GL_EXT_multisampled_render_to_texture
+    extern PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC glRenderbufferStorageMultisampleEXT;
+    extern PFNGLFRAMEBUFFERTEXTURE2DMULTISAMPLEEXTPROC glFramebufferTexture2DMultisampleEXT;
+#endif
+
 #else
     #include <bluegl/BlueGL.h>
 #endif