diff --git a/bacnet-stack/demo/object/ai.c b/bacnet-stack/demo/object/ai.c
index 35d5197d..370f2d2d 100644
--- a/bacnet-stack/demo/object/ai.c
+++ b/bacnet-stack/demo/object/ai.c
@@ -66,7 +66,7 @@ char *Analog_Input_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_ANALOG_INPUTS) {
-        sprintf(text_string, "ANALOG INPUT %u", object_instance);
+        sprintf(text_string, "ANALOG INPUT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/ao.c b/bacnet-stack/demo/object/ao.c
index 346b0c16..879f090a 100644
--- a/bacnet-stack/demo/object/ao.c
+++ b/bacnet-stack/demo/object/ao.c
@@ -212,7 +212,7 @@ char *Analog_Output_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_ANALOG_OUTPUTS) {
-        sprintf(text_string, "ANALOG OUTPUT %u", object_instance);
+        sprintf(text_string, "ANALOG OUTPUT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/av.c b/bacnet-stack/demo/object/av.c
index 022ce72c..fc088c74 100644
--- a/bacnet-stack/demo/object/av.c
+++ b/bacnet-stack/demo/object/av.c
@@ -142,7 +142,7 @@ char *Analog_Value_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_ANALOG_VALUES) {
-        sprintf(text_string, "ANALOG VALUE %u", object_instance);
+        sprintf(text_string, "ANALOG VALUE %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/bacfile.c b/bacnet-stack/demo/object/bacfile.c
index aa56a07b..110b24fd 100644
--- a/bacnet-stack/demo/object/bacfile.c
+++ b/bacnet-stack/demo/object/bacfile.c
@@ -155,7 +155,7 @@ int bacfile_encode_property_apdu(uint8_t * apdu,
             OBJECT_FILE, object_instance);
         break;
     case PROP_OBJECT_NAME:
-        sprintf(text_string, "FILE %d", object_instance);
+        sprintf(text_string, "FILE %lu", object_instance);
         characterstring_init_ansi(&char_string, text_string);
         apdu_len = encode_tagged_character_string(&apdu[0], &char_string);
         break;
diff --git a/bacnet-stack/demo/object/bi.c b/bacnet-stack/demo/object/bi.c
index 8e7211bc..20d13aba 100644
--- a/bacnet-stack/demo/object/bi.c
+++ b/bacnet-stack/demo/object/bi.c
@@ -114,7 +114,7 @@ char *Binary_Input_Name(uint32_t object_instance)
 
     Binary_Input_Init();
     if (object_instance < MAX_BINARY_INPUTS) {
-        sprintf(text_string, "BINARY INPUT %u", object_instance);
+        sprintf(text_string, "BINARY INPUT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/bo.c b/bacnet-stack/demo/object/bo.c
index a323b33b..e3f6f49f 100644
--- a/bacnet-stack/demo/object/bo.c
+++ b/bacnet-stack/demo/object/bo.c
@@ -132,7 +132,7 @@ char *Binary_Output_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_BINARY_OUTPUTS) {
-        sprintf(text_string, "BINARY OUTPUT %u", object_instance);
+        sprintf(text_string, "BINARY OUTPUT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/bv.c b/bacnet-stack/demo/object/bv.c
index b915d8dc..b9535323 100644
--- a/bacnet-stack/demo/object/bv.c
+++ b/bacnet-stack/demo/object/bv.c
@@ -132,7 +132,7 @@ char *Binary_Value_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_BINARY_VALUES) {
-        sprintf(text_string, "BINARY VALUE %u", object_instance);
+        sprintf(text_string, "BINARY VALUE %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/lc.c b/bacnet-stack/demo/object/lc.c
index 1174792d..3b3015bc 100644
--- a/bacnet-stack/demo/object/lc.c
+++ b/bacnet-stack/demo/object/lc.c
@@ -233,7 +233,7 @@ char *Load_Control_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_LOAD_CONTROLS) {
-        sprintf(text_string, "LOAD CONTROL %u", object_instance);
+        sprintf(text_string, "LOAD CONTROL %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/lo.c b/bacnet-stack/demo/object/lo.c
index 3446533c..c1f18e53 100644
--- a/bacnet-stack/demo/object/lo.c
+++ b/bacnet-stack/demo/object/lo.c
@@ -251,7 +251,7 @@ char *Lighting_Output_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_LIGHTING_OUTPUTS) {
-        sprintf(text_string, "LIGHTING OUTPUT %u", object_instance);
+        sprintf(text_string, "LIGHTING OUTPUT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/lsp.c b/bacnet-stack/demo/object/lsp.c
index 703764f6..c1341732 100644
--- a/bacnet-stack/demo/object/lsp.c
+++ b/bacnet-stack/demo/object/lsp.c
@@ -134,7 +134,7 @@ char *Life_Safety_Point_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_LIFE_SAFETY_POINTS) {
-        sprintf(text_string, "LS POINT %u", object_instance);
+        sprintf(text_string, "LS POINT %lu", object_instance);
         return text_string;
     }
 
diff --git a/bacnet-stack/demo/object/mso.c b/bacnet-stack/demo/object/mso.c
index 4c0395e9..c244aa64 100644
--- a/bacnet-stack/demo/object/mso.c
+++ b/bacnet-stack/demo/object/mso.c
@@ -136,7 +136,7 @@ char *Multistate_Output_Name(uint32_t object_instance)
     static char text_string[32] = "";   /* okay for single thread */
 
     if (object_instance < MAX_MULTISTATE_OUTPUTS) {
-        sprintf(text_string, "MULTISTATE OUTPUT %u", object_instance);
+        sprintf(text_string, "MULTISTATE OUTPUT %lu", object_instance);
         return text_string;
     }