diff --git a/src/libprojectM/Renderer/Framebuffer.cpp b/src/libprojectM/Renderer/Framebuffer.cpp
index 919f28762..7478c47d5 100644
--- a/src/libprojectM/Renderer/Framebuffer.cpp
+++ b/src/libprojectM/Renderer/Framebuffer.cpp
@@ -201,7 +201,11 @@ void Framebuffer::MaskDrawBuffer(int bufferIndex, bool masked)
 {
     // Invert the flag, as "true" means the color channel *will* be written.
     auto glMasked = static_cast<GLboolean>(!masked);
+#if USE_GLES
+    glColorMask(glMasked, glMasked, glMasked, glMasked);
+#else
     glColorMaski(bufferIndex, glMasked, glMasked, glMasked, glMasked);
+#endif
 }
 
 void Framebuffer::UpdateDrawBuffers(int framebufferIndex)
diff --git a/src/libprojectM/Renderer/TextureAttachment.cpp b/src/libprojectM/Renderer/TextureAttachment.cpp
index 24299a6e3..f39b69432 100644
--- a/src/libprojectM/Renderer/TextureAttachment.cpp
+++ b/src/libprojectM/Renderer/TextureAttachment.cpp
@@ -1,5 +1,10 @@
 #include "TextureAttachment.hpp"
 
+// OpenGL ES might not define this constant in its headers, e.g. in the iOS and Emscripten SDKs.
+#ifndef GL_STENCIL_INDEX
+#define GL_STENCIL_INDEX 0x1901
+#endif
+
 TextureAttachment::TextureAttachment(AttachmentType attachment, int width, int height)
     : m_attachmentType(attachment)
 {