diff --git a/sx_maxsockbuf.c b/sx_maxsockbuf.c
index 0e4a480..3cccb44 100644
--- a/sx_maxsockbuf.c
+++ b/sx_maxsockbuf.c
@@ -66,6 +66,10 @@ sx_maxsockbuf(int s, int dir)
 			} else if(phase==1) { 
 				phase=2; optval-=2048; continue;
 			} else break;
+		} else if(voptval>=SX_MAXSOCKBUF_MAX) { 
+			/* ... and getsockopt not failed and voptval>=optval. Do not allow
+			 * to increase sockbuf too much even in case OS permits it */
+			break;
 		};
 	};