diff --git a/libm/src/e_jnf.c b/libm/src/e_jnf.c
index 029dba6..a61fb68 100644
--- a/libm/src/e_jnf.c
+++ b/libm/src/e_jnf.c
@@ -186,7 +186,7 @@
 	b = __ieee754_y1f(x);
 	/* quit if b is -inf */
 	GET_FLOAT_WORD(ib,b);
-	for(i=1;i<n&&ib!=0xff800000;i++){
+	for(i=1; i<n && (((uint32_t)ib) != 0xff800000); i++){
 	    temp = b;
 	    b = ((float)(i+i)/x)*b - a;
 	    GET_FLOAT_WORD(ib,b);