diff --git a/sys/amd64/linux/linux_proto.h b/sys/amd64/linux/linux_proto.h
index 1814f1f92876..dabe5b0ff0c9 100644
--- a/sys/amd64/linux/linux_proto.h
+++ b/sys/amd64/linux/linux_proto.h
@@ -995,6 +995,7 @@ struct linux_epoll_pwait_args {
 	char maxevents_l_[PADL_(l_int)]; l_int maxevents; char maxevents_r_[PADR_(l_int)];
 	char timeout_l_[PADL_(l_int)]; l_int timeout; char timeout_r_[PADR_(l_int)];
 	char mask_l_[PADL_(l_sigset_t *)]; l_sigset_t * mask; char mask_r_[PADR_(l_sigset_t *)];
+	char sigsetsize_l_[PADL_(l_size_t)]; l_size_t sigsetsize; char sigsetsize_r_[PADR_(l_size_t)];
 };
 struct linux_signalfd_args {
 	register_t dummy;
diff --git a/sys/amd64/linux/linux_systrace_args.c b/sys/amd64/linux/linux_systrace_args.c
index 5ac00f4ea689..9adea93312ce 100644
--- a/sys/amd64/linux/linux_systrace_args.c
+++ b/sys/amd64/linux/linux_systrace_args.c
@@ -2068,7 +2068,8 @@ systrace_args(int sysnum, void *params, uint64_t *uarg, int *n_args)
 		iarg[2] = p->maxevents; /* l_int */
 		iarg[3] = p->timeout; /* l_int */
 		uarg[4] = (intptr_t) p->mask; /* l_sigset_t * */
-		*n_args = 5;
+		iarg[5] = p->sigsetsize; /* l_size_t */
+		*n_args = 6;
 		break;
 	}
 	/* linux_signalfd */
@@ -5646,6 +5647,9 @@ systrace_entry_setargdesc(int sysnum, int ndx, char *desc, size_t descsz)
 		case 4:
 			p = "userland l_sigset_t *";
 			break;
+		case 5:
+			p = "l_size_t";
+			break;
 		default:
 			break;
 		};
diff --git a/sys/amd64/linux32/linux32_proto.h b/sys/amd64/linux32/linux32_proto.h
index 836158c85d43..c4b2b3d68f56 100644
--- a/sys/amd64/linux32/linux32_proto.h
+++ b/sys/amd64/linux32/linux32_proto.h
@@ -1051,6 +1051,7 @@ struct linux_epoll_pwait_args {
 	char maxevents_l_[PADL_(l_int)]; l_int maxevents; char maxevents_r_[PADR_(l_int)];
 	char timeout_l_[PADL_(l_int)]; l_int timeout; char timeout_r_[PADR_(l_int)];
 	char mask_l_[PADL_(l_sigset_t *)]; l_sigset_t * mask; char mask_r_[PADR_(l_sigset_t *)];
+	char sigsetsize_l_[PADL_(l_size_t)]; l_size_t sigsetsize; char sigsetsize_r_[PADR_(l_size_t)];
 };
 struct linux_utimensat_args {
 	char dfd_l_[PADL_(l_int)]; l_int dfd; char dfd_r_[PADR_(l_int)];
diff --git a/sys/amd64/linux32/linux32_systrace_args.c b/sys/amd64/linux32/linux32_systrace_args.c
index 2cfdd8714a5a..523c4e544d94 100644
--- a/sys/amd64/linux32/linux32_systrace_args.c
+++ b/sys/amd64/linux32/linux32_systrace_args.c
@@ -2169,7 +2169,8 @@ systrace_args(int sysnum, void *params, uint64_t *uarg, int *n_args)
 		iarg[2] = p->maxevents; /* l_int */
 		iarg[3] = p->timeout; /* l_int */
 		uarg[4] = (intptr_t) p->mask; /* l_sigset_t * */
-		*n_args = 5;
+		iarg[5] = p->sigsetsize; /* l_size_t */
+		*n_args = 6;
 		break;
 	}
 	/* linux_utimensat */
@@ -5981,6 +5982,9 @@ systrace_entry_setargdesc(int sysnum, int ndx, char *desc, size_t descsz)
 		case 4:
 			p = "userland l_sigset_t *";
 			break;
+		case 5:
+			p = "l_size_t";
+			break;
 		default:
 			break;
 		};
diff --git a/sys/i386/linux/linux_proto.h b/sys/i386/linux/linux_proto.h
index 525f19d9658e..a953776fbb5c 100644
--- a/sys/i386/linux/linux_proto.h
+++ b/sys/i386/linux/linux_proto.h
@@ -1069,6 +1069,7 @@ struct linux_epoll_pwait_args {
 	char maxevents_l_[PADL_(l_int)]; l_int maxevents; char maxevents_r_[PADR_(l_int)];
 	char timeout_l_[PADL_(l_int)]; l_int timeout; char timeout_r_[PADR_(l_int)];
 	char mask_l_[PADL_(l_sigset_t *)]; l_sigset_t * mask; char mask_r_[PADR_(l_sigset_t *)];
+	char sigsetsize_l_[PADL_(l_size_t)]; l_size_t sigsetsize; char sigsetsize_r_[PADR_(l_size_t)];
 };
 struct linux_utimensat_args {
 	char dfd_l_[PADL_(l_int)]; l_int dfd; char dfd_r_[PADR_(l_int)];
diff --git a/sys/i386/linux/linux_systrace_args.c b/sys/i386/linux/linux_systrace_args.c
index d3c471028f9b..4f961bc9f44f 100644
--- a/sys/i386/linux/linux_systrace_args.c
+++ b/sys/i386/linux/linux_systrace_args.c
@@ -2245,7 +2245,8 @@ systrace_args(int sysnum, void *params, uint64_t *uarg, int *n_args)
 		iarg[2] = p->maxevents; /* l_int */
 		iarg[3] = p->timeout; /* l_int */
 		uarg[4] = (intptr_t) p->mask; /* l_sigset_t * */
-		*n_args = 5;
+		iarg[5] = p->sigsetsize; /* l_size_t */
+		*n_args = 6;
 		break;
 	}
 	/* linux_utimensat */
@@ -6212,6 +6213,9 @@ systrace_entry_setargdesc(int sysnum, int ndx, char *desc, size_t descsz)
 		case 4:
 			p = "userland l_sigset_t *";
 			break;
+		case 5:
+			p = "l_size_t";
+			break;
 		default:
 			break;
 		};