diff --git a/tools/emulator/opengl/system/GLESv1_enc/gl.attrib b/tools/emulator/opengl/system/GLESv1_enc/gl.attrib
index 1ca59040e..c189434ef 100644
--- a/tools/emulator/opengl/system/GLESv1_enc/gl.attrib
+++ b/tools/emulator/opengl/system/GLESv1_enc/gl.attrib
@@ -91,6 +91,7 @@ glColorPointer
 #void glCompressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, GLvoid *data)
 glCompressedTexImage2D
 	len data imageSize
+    var_flag data nullAllowed
 
 #void glCompressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLvoid *data)
 glCompressedTexSubImage2D
diff --git a/tools/emulator/opengl/system/GLESv2_enc/gl2.attrib b/tools/emulator/opengl/system/GLESv2_enc/gl2.attrib
index 3b37bd898..c4072225d 100644
--- a/tools/emulator/opengl/system/GLESv2_enc/gl2.attrib
+++ b/tools/emulator/opengl/system/GLESv2_enc/gl2.attrib
@@ -18,6 +18,7 @@ glBufferSubData
 #void glCompressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, GLvoid *data)
 glCompressedTexImage2D
 	len data imageSize
+    var_flag data nullAllowed
 
 #void glCompressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLvoid *data)
 glCompressedTexSubImage2D