Index: uspace/lib/math/generic/trunc.c
===================================================================
--- uspace/lib/math/generic/trunc.c	(revision 6c1c1f79aaaa7b2f5d4a551c5a9364e83ad78478)
+++ uspace/lib/math/generic/trunc.c	(revision 26cf7a62652ccbb33446b3b1dd9d3ff44eb9a194)
@@ -68,5 +68,5 @@
 	} else {
 		/* Truncate irrelevant fraction bits */
-		val.parts.fraction &= UINT64_C(0x000fffffffffffff) >> exp;
+		val.parts.fraction &= ~(UINT64_C(0x000fffffffffffff) >> exp);
 	}