diff --git a/bacnet-stack/demo/object/ai.c b/bacnet-stack/demo/object/ai.c
index 35d5197d..308ecf60 100644
--- a/bacnet-stack/demo/object/ai.c
+++ b/bacnet-stack/demo/object/ai.c
@@ -84,7 +84,7 @@ int Analog_Input_Encode_Property_APDU(uint8_t * apdu,
     int apdu_len = 0;           /* return value */
     BACNET_BIT_STRING bit_string;
     BACNET_CHARACTER_STRING char_string;
-    float value = (float) 3.14;
+    float value = 3.14159F;
 
     (void) array_index;
     switch (property) {