Datentyp von Header-File in Header-File einbinden

Hallo ich will den Datentyp aus Header 1 ic_t in eine zweites Header 2 
File includieren um Ihn in fan_t zu verwenden, dabei bekomme ich 
folgenden Fehler:

.\SRC\Control\FAN_CONTROL\fan_control.h(31): error:  #20: identifier 
"ic_t" is undefined

Meine google suche hat leider zu keinem Erfolg geführt, hat mir 
vielleicht jemand einen Tip wie es richtig geht?

//Header 1 -> input_capture.h
/* Define to prevent recursive inclusion 
-------------------------------------*/
#ifndef __input_capture_H
#define __input_capture_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include "stm32f4xx_hal.h"

typedef enum {
    IC_STATE_NO_INIT = 0,
    IC_STATE_OK,
    IC_STATE_ERROR
} ic_status_t;

typedef struct {
    ic_status_t status;
    uint16_t   rpm;
    uint16_t   timer;
    TIM_HandleTypeDef   hICtim;
    TIM_HandleTypeDef *p_channel;
    uint32_t   icChannel;
    uint16_t  lastICVal;
    uint16_t  actualSteps;
    uint16_t  targetSteps;
  uint16_t    lastCntVal;
  uint16_t    cntSteps;
} ic_t;

/* declaration of function prototypes 
-----------------------------------------*/
void ic_fan_start(ic_t* pThis);
uint16_t ic_get_fan_rpm (ic_t *pThis);
uint32_t ic_calc_prescaler(uint32_t freq);
void ic_fan_init(ic_t *pThis, uint32_t tim_cnt_mode);
void fan_input_capture_isr(ic_t * pThis);

#ifdef __cplusplus
}
#endif

#endif /* __input_capture_H */

//Header 2 -> -> fan_control.h
/* Define to prevent recursive inclusion 
-------------------------------------*/
#ifndef __fan_control_H
#define __fan_control_H

#ifdef __cplusplus
extern "C" {
#endif


#include "stdint.h"
#include "input_capture.h"
#include "pwm.h"

typedef enum {
    FAN_STATE_IDLE = 0,
    FAN_STATE_ON,
    FAN_STATE_ERROR,
} fan_state_t;

typedef struct {
    fan_state_t state;
    ic_t tacho;
    pwm_t   pwm;
    uint16_t timer;
    float esum;
} fan_t;

/* Private typedef 
-----------------------------------------------------------*/
void set_ic_fan1(fan_t* pThis);
fan_state_t fan_run (fan_t *pThis);

uint16_t fan_getActualRPM (fan_t *pThis);
void fan_pi_controller (fan_t *pThis);
fan_state_t fan_run (fan_t * pThis);

#ifdef __cplusplus
}
#endif

#endif /* __fan_control_H */