diff --git a/sysdeps/alpha/ffs.S b/sysdeps/alpha/ffs.S
index 23dff6e06b..6eb3afdff7 100644
--- a/sysdeps/alpha/ffs.S
+++ b/sysdeps/alpha/ffs.S
@@ -25,7 +25,7 @@
 	.set noreorder
 	.set noat
 
-ENTRY(ffs)
+ENTRY(__ffs)
 #ifdef PROF
 	ldgp	gp, 0(pv)
 	lda	AT, _mcount
@@ -69,4 +69,5 @@ ENTRY(ffs)
 
 $done:	ret
 
-	END(ffs)
+	END(__ffs)
+weak_alias (__ffs, ffs)
diff --git a/sysdeps/am29k/ffs.c b/sysdeps/am29k/ffs.c
index fe656e1697..bccec883df 100644
--- a/sysdeps/am29k/ffs.c
+++ b/sysdeps/am29k/ffs.c
@@ -26,7 +26,7 @@
 #ifdef	__GNUC__
 
 int
-ffs (x)
+__ffs (x)
      int x;
 {
   int cnt;
@@ -35,6 +35,7 @@ ffs (x)
 
   return 32 - cnt;
 }
+weak_alias (__ffs, ffs)
 
 #else
 #include <sysdeps/generic/ffs.c>
diff --git a/sysdeps/i960/ffs.c b/sysdeps/i960/ffs.c
index 7846c4b1db..dc09ba90e8 100644
--- a/sysdeps/i960/ffs.c
+++ b/sysdeps/i960/ffs.c
@@ -27,7 +27,7 @@
 #if	defined (__GNUC__) && defined (__i960__)
 
 int
-ffs (x)
+__ffs (x)
      int x;
 {
   int cnt;
@@ -36,6 +36,7 @@ ffs (x)
 
   return cnt;
 }
+weak_alias (__ffs, ffs)
 
 #else
 
diff --git a/sysdeps/m68k/ffs.c b/sysdeps/m68k/ffs.c
index 26044b12ec..d30bd9d6ff 100644
--- a/sysdeps/m68k/ffs.c
+++ b/sysdeps/m68k/ffs.c
@@ -26,7 +26,7 @@
 #if	defined (__GNUC__) && defined (__mc68020__)
 
 int
-ffs (x)
+__ffs (x)
      int x;
 {
   int cnt;
@@ -35,6 +35,7 @@ ffs (x)
 
   return 32 - cnt;
 }
+weak_alias (__ffs, ffs)
 
 #else
 
diff --git a/sysdeps/m88k/ffs.c b/sysdeps/m88k/ffs.c
index 3658f0882d..7aac897735 100644
--- a/sysdeps/m88k/ffs.c
+++ b/sysdeps/m88k/ffs.c
@@ -26,7 +26,7 @@
 #ifdef	__GNUC__
 
 int
-ffs (x)
+__ffs (x)
      int x;
 {
   int cnt;
@@ -37,6 +37,7 @@ ffs (x)
   asm ("ff1 %0,%1" : "=r" (cnt) : "r" (x & -x));
   return cnt + 1;
 }
+weak_alias (__ffs, ffs)
 
 #else
 #include <sysdeps/generic/ffs.c>
diff --git a/sysdeps/rs6000/ffs.c b/sysdeps/rs6000/ffs.c
index f078c91e98..2cf2302605 100644
--- a/sysdeps/rs6000/ffs.c
+++ b/sysdeps/rs6000/ffs.c
@@ -26,7 +26,7 @@
 #ifdef	__GNUC__
 
 int
-ffs (x)
+__ffs (x)
      int x;
 {
   int cnt;
@@ -34,6 +34,7 @@ ffs (x)
   asm ("cntlz %0,%1" : "=r" (cnt) : "r" (x & -x));
   return 32 - cnt;
 }
+weak_alias (__ffs, ffs)
 
 #else
 #include <sysdeps/generic/ffs.c>
diff --git a/sysdeps/vax/ffs.s b/sysdeps/vax/ffs.s
index 49faffb060..9f7ebc95fe 100644
--- a/sysdeps/vax/ffs.s
+++ b/sysdeps/vax/ffs.s
@@ -39,10 +39,11 @@
 
 #include "DEFS.h"
 
-ENTRY(ffs, 0)
+ENTRY(__ffs, 0)
 	ffs	$0,$32,4(ap),r0
 	bneq	1f
 	mnegl	$1,r0
 1:
 	incl	r0
 	ret
+weak_alias (__ffs, ffs)