diff --git a/src/OpenGL/libGLES_CM/Texture.cpp b/src/OpenGL/libGLES_CM/Texture.cpp
index 4d8b75a..ec97ee2 100644
--- a/src/OpenGL/libGLES_CM/Texture.cpp
+++ b/src/OpenGL/libGLES_CM/Texture.cpp
@@ -450,6 +450,8 @@
 
 	image[0] = surface->getRenderTarget();
 
+	assert(!mSurface); // eglBindTexImage called before eglReleaseTexImage
+
 	mSurface = surface;
 	mSurface->setBoundTexture(this);
 }
diff --git a/src/OpenGL/libGLESv2/Texture.cpp b/src/OpenGL/libGLESv2/Texture.cpp
index d6742d9..0266158 100644
--- a/src/OpenGL/libGLESv2/Texture.cpp
+++ b/src/OpenGL/libGLESv2/Texture.cpp
@@ -561,6 +561,8 @@
 
 	image[0] = surface->getRenderTarget();
 
+	assert(!mSurface); // eglBindTexImage called before eglReleaseTexImage
+
 	mSurface = surface;
 	mSurface->setBoundTexture(this);
 }