diff --git a/src/hal/components/sampler_usr.c b/src/hal/components/sampler_usr.c
index 71d2abeaa9e..8f12bb8e184 100644
--- a/src/hal/components/sampler_usr.c
+++ b/src/hal/components/sampler_usr.c
@@ -60,6 +60,7 @@
 */
 
 #include <stdio.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
@@ -221,10 +222,10 @@ int main(int argc, char **argv)
 		}
 		break;
 	    case HAL_UINT:
-		printf ( "%llu ", (unsigned long long)buf[n].k);
+		printf ( "%" PRIu64 " ", buf[n].k);
 		break;
 	    case HAL_SINT:
-		printf ( "%lld ", (long long)buf[n].l);
+		printf ( "%" PRId64 " ", buf[n].l);
 		break;
 	    default:
 		/* better not happen */
diff --git a/src/hal/drivers/mesa-hostmot2/hm2_eth.c b/src/hal/drivers/mesa-hostmot2/hm2_eth.c
index 76766382041..3e49205e5f1 100644
--- a/src/hal/drivers/mesa-hostmot2/hm2_eth.c
+++ b/src/hal/drivers/mesa-hostmot2/hm2_eth.c
@@ -900,9 +900,9 @@ static int hm2_eth_read(hm2_lowlevel_io_t *this, rtapi_u32 addr, void *buffer, i
     t2 = rtapi_get_time();
 
     if (recv == 4) {
-        LL_PRINT_IF(debug, "read(%d) : PACKET RECV [DATA: %08X | SIZE: %d | TIME: %llu]\n", board->read_cnt, *tmp_buffer, recv, t2 - t1);
+        LL_PRINT_IF(debug, "read(%d) : PACKET RECV [DATA: %08X | SIZE: %d | TIME: %lld]\n", board->read_cnt, *tmp_buffer, recv, t2 - t1);
     } else {
-        LL_PRINT_IF(debug, "read(%d) : PACKET RECV [SIZE: %d | TIME: %llu]\n", board->read_cnt, recv, t2 - t1);
+        LL_PRINT_IF(debug, "read(%d) : PACKET RECV [SIZE: %d | TIME: %lld]\n", board->read_cnt, recv, t2 - t1);
     }
     if (recv < 0)
         return 0;
@@ -1035,7 +1035,7 @@ static int hm2_eth_receive_queued_reads(hm2_lowlevel_io_t *this) {
         return -EAGAIN;
     }
 
-    LL_PRINT_IF(debug, "receive_queued_reads(%d) : PACKET RECV [SIZE: %d | TIME: %llu]\n", board->read_cnt, recv, t2 - t1);
+    LL_PRINT_IF(debug, "receive_queued_reads(%d) : PACKET RECV [SIZE: %d | TIME: %lld]\n", board->read_cnt, recv, t2 - t1);
 
     for (i = 0; i < board->queue_reads_count; i++) {
         memcpy(board->queue_reads[i].buffer, &tmp_buffer[board->queue_reads[i].from], board->queue_reads[i].size);
@@ -1154,7 +1154,7 @@ static int hm2_eth_send_queued_writes(hm2_lowlevel_io_t *this) {
         LL_PRINT("ERROR: sending packet: %s\n", strerror(errno));
     }
     t1 = rtapi_get_time();
-    LL_PRINT_IF(debug, "enqueue_write(%d) : PACKET SEND [SIZE: %d | TIME: %llu]\n", board->write_cnt, send, t1 - t0);
+    LL_PRINT_IF(debug, "enqueue_write(%d) : PACKET SEND [SIZE: %d | TIME: %lld]\n", board->write_cnt, send, t1 - t0);
     board->write_packet_ptr = board->write_packet;
     return send < 0 ? 0 : 1;
 }
diff --git a/src/hal/utils/halcmd_commands.cc b/src/hal/utils/halcmd_commands.cc
index 679c1605204..1e7775744e8 100644
--- a/src/hal/utils/halcmd_commands.cc
+++ b/src/hal/utils/halcmd_commands.cc
@@ -45,6 +45,7 @@
 #include <rtapi_string.h>	// rtapi_strlcpy
 
 #include <stdio.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
@@ -1704,18 +1705,18 @@ static void print_funct_info_print(const hal_query_t *q, const char **patterns)
     if(!match(patterns, q->name))
         return;
     if(!scriptmode) {
-        halcmd_output(" %05d  %08llx  %08llx  %-3s  %5d   %s\n",
+        halcmd_output(" %05d  %08" PRIxPTR "  %08" PRIxPTR "  %-3s  %5d   %s\n",
             q->funct.comp_id,
-            (long long)q->funct.funct,
-            (long long)q->funct.arg,
+            q->funct.funct,
+            q->funct.arg,
             "YES",  // Always uses FP
             q->funct.users,
             q->name);
     } else {
-        halcmd_output("%s %08llx %08llx %s %3d %s\n",
+        halcmd_output("%s %08" PRIxPTR " %08" PRIxPTR " %s %3d %s\n",
             q->funct.comp,
-            (long long)q->funct.funct,
-            (long long)q->funct.arg,
+            q->funct.funct,
+            q->funct.arg,
             "YES",  // Always uses FP
             q->funct.users,
             q->name);
diff --git a/src/hal/utils/halsh.c b/src/hal/utils/halsh.c
index 38ba87dc461..b18989433e1 100644
--- a/src/hal/utils/halsh.c
+++ b/src/hal/utils/halsh.c
@@ -17,6 +17,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <inttypes.h>
 #include <tcl.h>
 #include "halcmd.h"
 #include <hal.h>
@@ -113,8 +114,8 @@ static int halsh_format_one(Tcl_Interp *interp,
     switch(hal_stream_element_type(s, idx)) {
         case HAL_BOOL: snprintf(buf, sizeof(buf), "%d", v.b ? 1 : 0); break;
         case HAL_REAL: snprintf(buf, sizeof(buf), "%g", v.f); break;
-        case HAL_SINT: snprintf(buf, sizeof(buf), "%lld", (long long)v.l); break;
-        case HAL_UINT: snprintf(buf, sizeof(buf), "%llu", (unsigned long long)v.k); break;
+        case HAL_SINT: snprintf(buf, sizeof(buf), "%" PRId64, v.l); break;
+        case HAL_UINT: snprintf(buf, sizeof(buf), "%" PRIu64, v.k); break;
         default:       snprintf(buf, sizeof(buf), "0"); break;
     }
     Tcl_AppendElement(interp, buf);
diff --git a/src/hal/utils/meter.c b/src/hal/utils/meter.c
index 967ef4fce97..b911a6f0d56 100644
--- a/src/hal/utils/meter.c
+++ b/src/hal/utils/meter.c
@@ -50,6 +50,7 @@
 #define _(x) gettext(x)
 
 #include <sys/types.h>
+#include <inttypes.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -544,12 +545,12 @@ static const char *data_value(hal_type_t type, hal_refs_u ref)
 	value_str = buf;
 	break;
     case HAL_SINT:
-	snprintf(buf, sizeof(buf), "%10lld", (long long)hal_get_sint(ref.s));
+	snprintf(buf, sizeof(buf), "%10" PRId64, hal_get_sint(ref.s));
 	value_str = buf;
 	break;
     case HAL_UINT: {
-        unsigned long long v = hal_get_uint(ref.u);
-	snprintf(buf, sizeof(buf), "%10llu (0x%08llX)", v, v);
+        uint64_t v = hal_get_uint(ref.u);
+	snprintf(buf, sizeof(buf), "%10" PRIu64 " (0x%08" PRIX64 ")", v, v);
 	value_str = buf;
         }
 	break;