diff --git a/src/pkg/runtime/freebsd/thread.c b/src/pkg/runtime/freebsd/thread.c
index a4e1e13e51..5f44022365 100644
--- a/src/pkg/runtime/freebsd/thread.c
+++ b/src/pkg/runtime/freebsd/thread.c
@@ -141,7 +141,7 @@ newosproc(M *m, G *g, void *stk, void (*fn)(void))
 	param.arg = m;
 	param.stack_base = stk;
 	param.stack_size = g->stackbase - g->stackguard + 256;
-	param.child_tid = (int32*)&m->procid;
+	param.child_tid = (intptr*)&m->procid;
 	param.parent_tid = nil;
 	param.tls_base = (int8*)&m->tls[0];
 	param.tls_size = sizeof m->tls;
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 83b47b7a33..df1c45ae1f 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -18,8 +18,10 @@ typedef	double			float64;
 
 #ifdef _64BIT
 typedef	uint64		uintptr;
+typedef	int64		intptr;
 #else
 typedef	uint32		uintptr;
+typedef int32		intptr;
 #endif
 
 /*