diff --git a/opengl/include/EGL/eglext.h b/opengl/include/EGL/eglext.h
index 8578874..c8d228c 100644
--- a/opengl/include/EGL/eglext.h
+++ b/opengl/include/EGL/eglext.h
@@ -311,6 +311,18 @@
 #define EGL_FRAMEBUFFER_TARGET_ANDROID                0x3147
 #endif
 
+/* EGL_ANDROID_presentation_time
+ */
+#ifndef EGL_ANDROID_presentation_time
+#define EGL_ANDROID_presentation_time 1
+typedef khronos_stime_nanoseconds_t EGLnsecsANDROID;
+#ifdef EGL_EGLEXT_PROTOTYPES
+EGLAPI EGLBoolean eglPresentationTimeANDROID(EGLDisplay dpy, EGLSurface sur, EGLnsecsANDROID time);
+#else
+typedef EGLBoolean (EGLAPIENTRYP PFNEGLPRESENTATIONTIMEANDROID) (EGLDisplay dpy, EGLSurface sur, EGLnsecsANDROID time);
+#endif
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index ed9db94..978ab04 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -1307,6 +1307,28 @@
     return result;
 }
 
+EGLBoolean eglPresentationTimeANDROID(EGLDisplay dpy, EGLSurface surface,
+        EGLnsecsANDROID time)
+{
+    clearError();
+
+    const egl_display_ptr dp = validate_display(dpy);
+    if (!dp) {
+        return EGL_FALSE;
+    }
+
+    SurfaceRef _s(dp.get(), surface);
+    if (!_s.get()) {
+        setError(EGL_BAD_SURFACE, EGL_FALSE);
+        return EGL_FALSE;
+    }
+
+    egl_surface_t const * const s = get_surface(surface);
+    native_window_set_buffers_timestamp(s->win.get(), time);
+
+    return EGL_TRUE;
+}
+
 // ----------------------------------------------------------------------------
 // NVIDIA extensions
 // ----------------------------------------------------------------------------
diff --git a/opengl/tools/glgen/specs/egl/EGL14.spec b/opengl/tools/glgen/specs/egl/EGL14.spec
index 828e114..aef0bcb 100644
--- a/opengl/tools/glgen/specs/egl/EGL14.spec
+++ b/opengl/tools/glgen/specs/egl/EGL14.spec
@@ -31,3 +31,4 @@
 EGLBoolean eglWaitNative ( EGLint engine )
 EGLBoolean eglSwapBuffers ( EGLDisplay dpy, EGLSurface surface )
 EGLBoolean eglCopyBuffers ( EGLDisplay dpy, EGLSurface surface, EGLNativePixmapType target )
+EGLBoolean eglPresentationTimeANDROID ( EGLDisplay dpy, EGLSurface sur, EGLnsecsANDROID time )
diff --git a/opengl/tools/glgen/src/JType.java b/opengl/tools/glgen/src/JType.java
index 3f7cb73..994e609 100644
--- a/opengl/tools/glgen/src/JType.java
+++ b/opengl/tools/glgen/src/JType.java
@@ -56,6 +56,7 @@
     typeMapping.put(new CType("EGLNativeWindowType"), new JType("int"));
     typeMapping.put(new CType("EGLNativeDisplayType"), new JType("int"));
     typeMapping.put(new CType("EGLClientBuffer"), new JType("int"));
+    typeMapping.put(new CType("EGLnsecsANDROID"), new JType("long"));
 
     // EGL nonprimitive types
     typeMapping.put(new CType("EGLConfig"), new JType("EGLConfig", true, false));
diff --git a/opengl/tools/glgen/src/JniCodeEmitter.java b/opengl/tools/glgen/src/JniCodeEmitter.java
index 01c5c48..ffe3767 100644
--- a/opengl/tools/glgen/src/JniCodeEmitter.java
+++ b/opengl/tools/glgen/src/JniCodeEmitter.java
@@ -54,7 +54,7 @@
         } else if (baseType.equals("short")) {
             jniName += "S";
         } else if (baseType.equals("long")) {
-            jniName += "L";
+            jniName += "J";
         } else if (baseType.equals("byte")) {
             jniName += "B";
         } else if (baseType.equals("String")) {