diff --git a/src/libGLESv2/ProgramBinary.h b/src/libGLESv2/ProgramBinary.h
index 78d8ed8..328ffe2 100644
--- a/src/libGLESv2/ProgramBinary.h
+++ b/src/libGLESv2/ProgramBinary.h
@@ -127,6 +127,7 @@
     void getActiveUniformBlockName(GLuint uniformBlockIndex, GLsizei bufSize, GLsizei *length, GLchar *uniformBlockName) const;
     void getActiveUniformBlockiv(GLuint uniformBlockIndex, GLenum pname, GLint *params) const;
     GLuint getActiveUniformBlockCount() const;
+    GLuint getActiveUniformBlockMaxLength() const;
 
     void validate(InfoLog &infoLog);
     bool validateSamplers(InfoLog *infoLog);