diff --git a/core/src/processing/opengl/PJOGL.java b/core/src/processing/opengl/PJOGL.java
index 42d17a0c6..b1ff43677 100644
--- a/core/src/processing/opengl/PJOGL.java
+++ b/core/src/processing/opengl/PJOGL.java
@@ -1950,6 +1950,8 @@ public class PJOGL extends PGL {
       gl2x.glReadBuffer(buf);
     } else if (gl3 != null) {
       gl3.glReadBuffer(buf);
+    } else if (gl3es3 != null) {
+      gl3es3.glReadBuffer(buf);
     } else {
       throw new RuntimeException(String.format(MISSING_GLFUNC_ERROR, "glReadBuffer()"));
     }