diff --git a/common/jpeg/jcdctmgr.c b/common/jpeg/jcdctmgr.c
index 67f8228..156957a 100644
--- a/common/jpeg/jcdctmgr.c
+++ b/common/jpeg/jcdctmgr.c
@@ -73,7 +73,7 @@
  * Find the highest bit in an integer through binary search.
  */
 LOCAL(int)
-fls (UINT16 val)
+flss (UINT16 val)
 {
   int bit;
 
@@ -167,7 +167,7 @@
   UDCTELEM c;
   int b, r;
 
-  b = fls(divisor) - 1;
+  b = flss(divisor) - 1;
   r  = sizeof(DCTELEM) * 8 + b;
 
   fq = ((UDCTELEM2)1 << r) / divisor;