diff --git a/src/libc/gen/isnanf.c b/src/libc/gen/isnanf.c
index a3eaa52..2b298fe 100644
--- a/src/libc/gen/isnanf.c
+++ b/src/libc/gen/isnanf.c
@@ -11,15 +11,31 @@
  * isnan(x) returns 1 is x is nan, else 0;
  * no branching!
  */
-int isnanf (float x)
-{
-	long lx = *(long*) &x;
 
+typedef union {
+    float x;
+    struct {
+            long lxx;
+        };
+} ival;
+
+//int isnanf (float x)
+//{
+//	long lx = *(long*) &x;
+//	lx = 0x7f800000 - (lx & 0x7fffffff);
+//	return (int) (((unsigned long) lx) >> 31);
+//}
+int isnanf (float xx) {
+    ival temp;
+    temp.x = xx;
+    long lx = temp.lxx;
 	lx = 0x7f800000 - (lx & 0x7fffffff);
 	return (int) (((unsigned long) lx) >> 31);
 }
 
+
+
 /*
  * For PIC32, double is the same as float.
  */
-int isnan (double x) __attribute__((alias ("isnanf")));
+//int isnan (double x) __attribute__((alias ("isnanf")));