diff --git a/lib/libc/stdlib/div.c b/lib/libc/stdlib/div.c
index 7dfe553f4a05..0bafbe607037 100644
--- a/lib/libc/stdlib/div.c
+++ b/lib/libc/stdlib/div.c
@@ -46,6 +46,7 @@ div(num, denom)
 
 	r.quot = num / denom;
 	r.rem = num % denom;
+#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
 	/*
 	 * The ANSI standard says that |r.quot| <= |n/d|, where
 	 * n/d is to be computed in infinite precision.  In other
@@ -73,5 +74,6 @@ div(num, denom)
 		r.quot++;
 		r.rem -= denom;
 	}
+#endif
 	return (r);
 }
diff --git a/lib/libc/stdlib/imaxdiv.c b/lib/libc/stdlib/imaxdiv.c
index 7dae4675e2b1..adcab0b14dbb 100644
--- a/lib/libc/stdlib/imaxdiv.c
+++ b/lib/libc/stdlib/imaxdiv.c
@@ -37,9 +37,11 @@ imaxdiv(intmax_t numer, intmax_t denom)
 
 	retval.quot = numer / denom;
 	retval.rem = numer % denom;
+#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
 	if (numer >= 0 && retval.rem < 0) {
 		retval.quot++;
 		retval.rem -= denom;
 	}
+#endif
 	return (retval);
 }
diff --git a/lib/libc/stdlib/ldiv.c b/lib/libc/stdlib/ldiv.c
index 0ec98e65547d..745c5667e6a4 100644
--- a/lib/libc/stdlib/ldiv.c
+++ b/lib/libc/stdlib/ldiv.c
@@ -48,9 +48,11 @@ ldiv(num, denom)
 
 	r.quot = num / denom;
 	r.rem = num % denom;
+#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
 	if (num >= 0 && r.rem < 0) {
 		r.quot++;
 		r.rem -= denom;
 	}
+#endif
 	return (r);
 }
diff --git a/lib/libc/stdlib/lldiv.c b/lib/libc/stdlib/lldiv.c
index b34b65e8632d..197b48f3f51e 100644
--- a/lib/libc/stdlib/lldiv.c
+++ b/lib/libc/stdlib/lldiv.c
@@ -37,9 +37,11 @@ lldiv(long long numer, long long denom)
 
 	retval.quot = numer / denom;
 	retval.rem = numer % denom;
+#if !defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)
 	if (numer >= 0 && retval.rem < 0) {
 		retval.quot++;
 		retval.rem -= denom;
 	}
+#endif
 	return (retval);
 }