diff --git a/sys/amd64/linux32/syscalls.master b/sys/amd64/linux32/syscalls.master
index 01e80643367..3d34610e2dc 100644
--- a/sys/amd64/linux32/syscalls.master
+++ b/sys/amd64/linux32/syscalls.master
@@ -912,10 +912,10 @@
 172	AUE_PRCTL	STD {
 		int linux_prctl(
 		    l_int option,
-		    l_int arg2,
-		    l_int arg3,
-		    l_int arg4,
-		    l_int arg5
+		    l_uintptr_t arg2,
+		    l_ulntptr_t arg3,
+		    l_uintptr_t arg4,
+		    l_uintptr_t arg5
 		);
 	}
 173	AUE_NULL	STD {
diff --git a/sys/i386/linux/syscalls.master b/sys/i386/linux/syscalls.master
index 60125205467..8a47f70acaf 100644
--- a/sys/i386/linux/syscalls.master
+++ b/sys/i386/linux/syscalls.master
@@ -937,10 +937,10 @@
 172	AUE_PRCTL	STD {
 		int linux_prctl(
 		    l_int option,
-		    l_int arg2,
-		    l_int arg3,
-		    l_int arg4,
-		    l_int arg5
+		    l_uintptr_t arg2,
+		    l_ulntptr_t arg3,
+		    l_uintptr_t arg4,
+		    l_uintptr_t arg5
 		);
 	}
 173	AUE_NULL	STD {