diff --git a/src/glimports.h b/src/glimports.h
index 0209f0b5f..da67090a5 100644
--- a/src/glimports.h
+++ b/src/glimports.h
@@ -533,6 +533,7 @@ GL_IMPORT_NV___(true,  PFNGLBEGINQUERYPROC,                        glBeginQuery)
 GL_IMPORT_NV___(true,  PFNGLENDQUERYPROC,                          glEndQuery);
 GL_IMPORT_NV___(true,  PFNGLGETQUERYOBJECTIVPROC,                  glGetQueryObjectiv);
 GL_IMPORT_NV___(true,  PFNGLGETQUERYOBJECTUI64VPROC,               glGetQueryObjectui64v);
+GL_IMPORT_NV___(true,  PFNGLQUERYCOUNTERPROC,                      glQueryCounter);
 
 GL_IMPORT      (true,  PFNGLINVALIDATEFRAMEBUFFERPROC,             glInvalidateFramebuffer, glDiscardFramebufferEXT);
 
@@ -597,6 +598,7 @@ GL_IMPORT______(true,  PFNGLBEGINQUERYPROC,                        glBeginQuery)
 GL_IMPORT______(true,  PFNGLENDQUERYPROC,                          glEndQuery);
 GL_IMPORT______(true,  PFNGLGETQUERYOBJECTIVPROC,                  glGetQueryObjectiv);
 GL_IMPORT______(true,  PFNGLGETQUERYOBJECTUI64VPROC,               glGetQueryObjectui64v);
+GL_IMPORT______(true,  PFNGLQUERYCOUNTERPROC,                      glQueryCounter);
 
 GL_IMPORT______(true,  PFNGLDRAWARRAYSINDIRECTPROC,                glDrawArraysIndirect);
 GL_IMPORT______(true,  PFNGLDRAWELEMENTSINDIRECTPROC,              glDrawElementsIndirect);
diff --git a/src/renderer_gl.h b/src/renderer_gl.h
index 7be0df4c7..06bceb2ee 100644
--- a/src/renderer_gl.h
+++ b/src/renderer_gl.h
@@ -509,6 +509,10 @@ typedef uint64_t GLuint64;
 #	define GL_TIME_ELAPSED 0x88BF
 #endif // GL_TIME_ELAPSED
 
+#ifndef GL_TIMESTAMP
+#	define GL_TIMESTAMP 0x8E28
+#endif // GL_TIMESTAMP
+
 #ifndef GL_VBO_FREE_MEMORY_ATI
 #	define GL_VBO_FREE_MEMORY_ATI 0x87FB
 #endif // GL_VBO_FREE_MEMORY_ATI