diff --git a/rtengine/sleef.c b/rtengine/sleef.c
index d540b2f2c..f44a2b9da 100755
--- a/rtengine/sleef.c
+++ b/rtengine/sleef.c
@@ -75,7 +75,7 @@ __inline int ilogbp1(double d) {
 
 __inline int xilogb(double d) {
   int e = ilogbp1(xfabs(d)) - 1;
-  e = d == 0 ? -2147483648 : e;
+  e = d == 0 ? (-2147483647 - 1) : e;
   e = d == INFINITY || d == -INFINITY ? 2147483647 : e;
   return e;
 }