diff --git a/include/mbedtls/timing.h b/include/mbedtls/timing.h
index 5289889f9..6ffc812d8 100644
--- a/include/mbedtls/timing.h
+++ b/include/mbedtls/timing.h
@@ -61,8 +61,6 @@ typedef struct mbedtls_timing_delay_context
 #include "timing_alt.h"
 #endif /* MBEDTLS_TIMING_ALT */
 
-extern volatile int mbedtls_timing_alarmed;
-
 /* Internal use */
 unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset );
 
diff --git a/library/timing.c b/library/timing.c
index e6dfc72d1..a85ce67b8 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -56,8 +56,25 @@ struct _hr_time
 
 #endif /* _WIN32 && !EFIX64 && !EFI32 */
 
-volatile int mbedtls_timing_alarmed = 0;
-
+/**
+ * \brief          Return the elapsed time in milliseconds
+ *
+ * \warning        May change without notice
+ *
+ * \param val      points to a timer structure
+ * \param reset    If 0, query the elapsed time. Otherwise (re)start the timer.
+ *
+ * \return         Elapsed time since the previous reset in ms. When
+ *                 restarting, this is always 0.
+ *
+ * \note           To initialize a timer, call this function with reset=1.
+ *
+ *                 Determining the elapsed time and resetting the timer is not
+ *                 atomic on all platforms, so after the sequence
+ *                 `{ get_timer(1); ...; time1 = get_timer(1); ...; time2 =
+ *                 get_timer(0) }` the value time1+time2 is only approximately
+ *                 the delay since the first reset.
+ */
 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
 
 unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
@@ -83,25 +100,6 @@ unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int
 
 #else /* _WIN32 && !EFIX64 && !EFI32 */
 
-/**
- * \brief          Return the elapsed time in milliseconds
- *
- * \warning        May change without notice
- *
- * \param val      points to a timer structure
- * \param reset    If 0, query the elapsed time. Otherwise (re)start the timer.
- *
- * \return         Elapsed time since the previous reset in ms. When
- *                 restarting, this is always 0.
- *
- * \note           To initialize a timer, call this function with reset=1.
- *
- *                 Determining the elapsed time and resetting the timer is not
- *                 atomic on all platforms, so after the sequence
- *                 `{ get_timer(1); ...; time1 = get_timer(1); ...; time2 =
- *                 get_timer(0) }` the value time1+time2 is only approximately
- *                 the delay since the first reset.
- */
 unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
 {
     struct _hr_time *t = (struct _hr_time *) val;