diff --git a/codels/natnet.c b/codels/natnet.c
index b966b94..0149f0f 100644
--- a/codels/natnet.c
+++ b/codels/natnet.c
@@ -160,8 +160,7 @@ natnet_rcv_modeldef(natnet_context_s ctx)
   union { const char *c; const uint32_t *u; const float *f; const void *v; } p;
   struct natnet_msetdescr *mset;
   struct natnet_bodydescr *body;
-  uint32_t k, n, m;
-  int i, j;
+  uint32_t k, n, m, i, j;
 
   assert(ctx && ctx->msg.id == NAT_MODELDEF);
 
@@ -266,8 +265,7 @@ natnet_rcv_frameofdata(natnet_context_s ctx)
   union { const char *c; const uint32_t *u; const float *f; const void *v; } p;
   struct natnet_mset *mset;
   struct natnet_body *body;
-  uint32_t n, m, o;
-  int i, j;
+  uint32_t n, m, o, i, j;
 
   assert(ctx && ctx->msg.id == NAT_FRAMEOFDATA);
   p.c = ctx->msg.data.c;
@@ -692,7 +690,7 @@ log:
 void
 natnet_disconnect(natnet_context_s ctx)
 {
-  int i, j;
+  uint32_t i, j;
 
   if (!ctx) return;
 
diff --git a/codels/ports.c b/codels/ports.c
index 1ca33eb..9caef42 100644
--- a/codels/ports.c
+++ b/codels/ports.c
@@ -31,7 +31,7 @@ opti_create_ports(const struct natnet_descr *descr,
 {
   const struct natnet_bodydescr *body;
   genom_event e;
-  int i;
+  uint32_t i;
 
   for(i = 0, body = descr->body; i < descr->nbodies; i++, body++) {
     if (bodies->data(body->safename)) continue;
@@ -59,7 +59,7 @@ opti_update_ports(const struct natnet_frame *f,
   struct timeval tv;
   double qx, qy, qz, qw;
   genom_event e;
-  int i;
+  uint32_t i;
 
   for(i=0, body=f->body; i<f->nbodies; i++, body++) {
     if (body->descr == NULL) {