diff --git a/flight/pios/common/pios_deltatime.c b/flight/pios/common/pios_deltatime.c
index 5a2b56f02..ec5ee8eb9 100644
--- a/flight/pios/common/pios_deltatime.c
+++ b/flight/pios/common/pios_deltatime.c
@@ -30,7 +30,6 @@
 
 #include <pios.h>
 
-#ifdef PIOS_INCLUDE_DELTATIME
 
 void PIOS_DELTATIME_Init(PiOSDeltatimeConfig *config, float average, float min, float max, float alpha)
 {
@@ -59,9 +58,6 @@ float PIOS_DELTATIME_GetAverageSeconds(PiOSDeltatimeConfig *config)
 }
 
 
-#endif // PIOS_INCLUDE_DELTATIME
-
-
 /**
  * @}
  * @}
diff --git a/flight/pios/pios.h b/flight/pios/pios.h
index 95ee81d47..c1371d866 100644
--- a/flight/pios/pios.h
+++ b/flight/pios/pios.h
@@ -102,9 +102,6 @@
 /* PIOS system functions */
 #ifdef PIOS_INCLUDE_DELAY
 #include <pios_delay.h>
-#endif
-
-#ifdef PIOS_INCLUDE_DELTATIME
 #include <pios_deltatime.h>
 #endif
 
diff --git a/flight/targets/boards/coptercontrol/firmware/inc/pios_config.h b/flight/targets/boards/coptercontrol/firmware/inc/pios_config.h
index e0498e3e1..ea94abb02 100644
--- a/flight/targets/boards/coptercontrol/firmware/inc/pios_config.h
+++ b/flight/targets/boards/coptercontrol/firmware/inc/pios_config.h
@@ -49,7 +49,6 @@
 
 /* PIOS system functions */
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_INITCALL
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_TASK_MONITOR
diff --git a/flight/targets/boards/coptercontrol/firmware/inc/pios_config_posix.h b/flight/targets/boards/coptercontrol/firmware/inc/pios_config_posix.h
index 4dc76d13d..eda0a2511 100644
--- a/flight/targets/boards/coptercontrol/firmware/inc/pios_config_posix.h
+++ b/flight/targets/boards/coptercontrol/firmware/inc/pios_config_posix.h
@@ -32,7 +32,6 @@
 /* Enable/Disable PiOS Modules */
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_LED
 #define PIOS_INCLUDE_FREERTOS
 #define PIOS_INCLUDE_TASK_MONITOR
diff --git a/flight/targets/boards/revolution/firmware/inc/pios_config.h b/flight/targets/boards/revolution/firmware/inc/pios_config.h
index c2d7673a8..fbaff9438 100644
--- a/flight/targets/boards/revolution/firmware/inc/pios_config.h
+++ b/flight/targets/boards/revolution/firmware/inc/pios_config.h
@@ -49,7 +49,6 @@
 
 /* PIOS system functions */
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_INITCALL
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_TASK_MONITOR
diff --git a/flight/targets/boards/revolution/firmware/inc/pios_config_sim.h b/flight/targets/boards/revolution/firmware/inc/pios_config_sim.h
index 9402af396..293516522 100644
--- a/flight/targets/boards/revolution/firmware/inc/pios_config_sim.h
+++ b/flight/targets/boards/revolution/firmware/inc/pios_config_sim.h
@@ -32,7 +32,6 @@
 /* Enable/Disable PiOS Modules */
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_LED
 #define PIOS_INCLUDE_SDCARD
 #define PIOS_INCLUDE_FREERTOS
diff --git a/flight/targets/boards/revoproto/firmware/inc/pios_config.h b/flight/targets/boards/revoproto/firmware/inc/pios_config.h
index afd32c159..c8e3d340c 100644
--- a/flight/targets/boards/revoproto/firmware/inc/pios_config.h
+++ b/flight/targets/boards/revoproto/firmware/inc/pios_config.h
@@ -49,7 +49,6 @@
 
 /* PIOS system functions */
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_INITCALL
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_TASK_MONITOR
diff --git a/flight/targets/boards/revoproto/firmware/inc/pios_config_sim.h b/flight/targets/boards/revoproto/firmware/inc/pios_config_sim.h
index 0d6dd38a3..56470b59b 100644
--- a/flight/targets/boards/revoproto/firmware/inc/pios_config_sim.h
+++ b/flight/targets/boards/revoproto/firmware/inc/pios_config_sim.h
@@ -1,5 +1,4 @@
 /**
-   #define PIOS_INCLUDE_DELTATIME
  ******************************************************************************
  *
  * @file       pios_config.h
@@ -33,7 +32,6 @@
 /* Enable/Disable PiOS Modules */
 #define PIOS_INCLUDE_SYS
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 #define PIOS_INCLUDE_LED
 #define PIOS_INCLUDE_SDCARD
 #define PIOS_INCLUDE_FREERTOS
diff --git a/flight/targets/boards/simposix/firmware/inc/pios_config.h b/flight/targets/boards/simposix/firmware/inc/pios_config.h
index 0738b6e44..f3b494e91 100644
--- a/flight/targets/boards/simposix/firmware/inc/pios_config.h
+++ b/flight/targets/boards/simposix/firmware/inc/pios_config.h
@@ -41,7 +41,6 @@
 /* Enable/Disable PiOS Modules */
 // #define PIOS_INCLUDE_ADC
 #define PIOS_INCLUDE_DELAY
-#define PIOS_INCLUDE_DELTATIME
 // #define PIOS_INCLUDE_I2C
 #define PIOS_INCLUDE_IRQ
 #define PIOS_INCLUDE_LED