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-rw-r--r--src/math/modfl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/modfl.c b/src/math/modfl.c
index 6520a1c2..f6d62444 100644
--- a/src/math/modfl.c
+++ b/src/math/modfl.c
@@ -81,7 +81,7 @@ long double modfl(long double x, long double *iptr)
 		return x - ux.e;
 	} else if (e >= LDBL_MANT_DIG - 1) {    /* x has no fraction part. */
 		*iptr = x;
-		if (e == LDBL_MAX_EXP && (ux.bits.manh|ux.bits.manl)) /* nan */
+		if (e == LDBL_MAX_EXP && ((ux.bits.manh&~LDBL_NBIT)|ux.bits.manl)) /* nan */
 			return x;
 		return zero[ux.bits.sign];
 	} else {                                /* Fraction part is in manl. */