diff --git a/include/villas/utils.h b/include/villas/utils.h
index 8b3a1e2bf..99fbf4bfb 100644
--- a/include/villas/utils.h
+++ b/include/villas/utils.h
@@ -138,10 +138,6 @@ char * vstrcatf(char **dest, const char *fmt, va_list va)
 #define strf(fmt, ...) strcatf(&(char *) { NULL }, fmt, ##__VA_ARGS__)
 #define vstrf(fmt, va) vstrcatf(&(char *) { NULL }, fmt, va)
 
-/** Format a struct timespec date similar to strftime() */
-int strftimespec(char *s, size_t max, const char *format, struct timespec *ts)
-	__attribute__ ((format(strftime, 3, 0)));
-
 /** Convert integer to cpu_set_t.
  *
  * @param set An integer number which is used as the mask
diff --git a/lib/utils.c b/lib/utils.c
index 9d478686e..4b408d940 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -38,35 +38,6 @@ int version_cmp(struct version *a, struct version *b) {
 	return major ? major : minor;
 }
 
-int strftimespec(char *dst, size_t max, const char *fmt, struct timespec *ts)
-{
-	int s, d;
-	char fmt2[64], dst2[64];
-
-	for (s=0, d=0; fmt[s] && d < 64;) {
-		char c = fmt2[d++] = fmt[s++];
-		if (c == '%') {
-			char n = fmt[s];
-			if (n == 'u') {
-				fmt2[d++] = '0';
-				fmt2[d++] = '3';
-			}
-			else
-				fmt2[d++] = '%';
-		}
-	}
-	
-	/* Print sub-second part to format string */
-	snprintf(dst2, sizeof(dst2), fmt2, ts->tv_nsec / 1000000);
-
-	/* Print timestamp */
-	struct tm tm;
-	if (localtime_r(&(ts->tv_sec), &tm) == NULL)
-		return -1;
-
-	return strftime(dst, max, dst2, &tm);
-}
-
 double box_muller(float m, float s)
 {
 	double x1, x2, y1;