diff --git a/glx/singlepix.c b/glx/singlepix.c
index 7b2cb4ca6d..a0a6a79188 100644
--- a/glx/singlepix.c
+++ b/glx/singlepix.c
@@ -91,6 +91,7 @@ int __glXDisp_ReadPixels(__GLXclientState *cl, GLbyte *pc)
 	__GLX_SEND_HEADER();
 	__GLX_SEND_VOID_ARRAY(compsize);
     }
+    __GLX_NOTE_FLUSHED_CMDS(cx);
     return Success;
 }
 
diff --git a/glx/singlepixswap.c b/glx/singlepixswap.c
index 143f2049a3..a7febc9a65 100644
--- a/glx/singlepixswap.c
+++ b/glx/singlepixswap.c
@@ -102,6 +102,7 @@ int __glXDispSwap_ReadPixels(__GLXclientState *cl, GLbyte *pc)
 	__GLX_SEND_HEADER();
 	__GLX_SEND_VOID_ARRAY(compsize);
     }
+    __GLX_NOTE_FLUSHED_CMDS(cx);
     return Success;
 }