diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index 5f7b7c3..90efaee 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -179,6 +179,11 @@
 			if (fdtab[fd].ev & FD_POLL_OUT)
 				fd_ev_set(fd, DIR_WR);
 
+			if (fdtab[fd].spec_p) {
+				/* This fd was already scheduled for being called as a speculative I/O */
+				continue;
+			}
+
 			/* Save number of updates to detect creation of new FDs. */
 			old_updt = fd_nbupdt;
 			fdtab[fd].iocb(fd);
diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
index 36a7b7f..2142132 100644
--- a/src/ev_kqueue.c
+++ b/src/ev_kqueue.c
@@ -158,6 +158,13 @@
 			if (fdtab[fd].ev & FD_POLL_OUT)
 				fd_ev_set(fd, DIR_WR);
 
+			if (fdtab[fd].spec_p) {
+				/* This fd was already scheduled for being
+				 * called as a speculative I/O.
+				 */
+				continue;
+			}
+
 			fdtab[fd].iocb(fd);
 		}
 	}
diff --git a/src/ev_poll.c b/src/ev_poll.c
index c09232e..e3ea4db 100644
--- a/src/ev_poll.c
+++ b/src/ev_poll.c
@@ -181,6 +181,13 @@
 			if (fdtab[fd].ev & FD_POLL_OUT)
 				fd_ev_set(fd, DIR_WR);
 
+			if (fdtab[fd].spec_p) {
+				/* This fd was already scheduled for being
+				 * called as a speculative I/O
+				 */
+				continue;
+			}
+
 			fdtab[fd].iocb(fd);
 		}
 	}
diff --git a/src/ev_select.c b/src/ev_select.c
index 48a62da..dba5928 100644
--- a/src/ev_select.c
+++ b/src/ev_select.c
@@ -167,6 +167,13 @@
 				if (fdtab[fd].ev & FD_POLL_OUT)
 					fd_ev_set(fd, DIR_WR);
 
+				if (fdtab[fd].spec_p) {
+					/* This fd was already scheduled for being
+					 * called as a speculative I/O.
+					 */
+					continue;
+				}
+
 				fdtab[fd].iocb(fd);
 			}
 		}