diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index e103ace8fcf..3d8b73e1c4a 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,5 +1,8 @@
 2017-11-30  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
+	* config/rs6000/_mulkc3.c (__mulkc3): Add forward declaration.
+	* config/rs6000/_divkc3.c (__divkc3): Likewise.
+
 	PR libgcc/83112
 	* config/rs6000/float128-ifunc.c (__addkf3_resolve): Use the
 	correct type for all ifunc resolvers to silence -Wattribute-alias
diff --git a/libgcc/config/rs6000/_divkc3.c b/libgcc/config/rs6000/_divkc3.c
index 5c477f4d0b8..800389b169b 100644
--- a/libgcc/config/rs6000/_divkc3.c
+++ b/libgcc/config/rs6000/_divkc3.c
@@ -37,6 +37,8 @@ typedef __complex float KCtype __attribute__ ((mode (KC)));
 #define __divkc3 __divkc3_sw
 #endif
 
+extern KCtype __divkc3 (KFtype, KFtype, KFtype, KFtype);
+
 KCtype
 __divkc3 (KFtype a, KFtype b, KFtype c, KFtype d)
 {
diff --git a/libgcc/config/rs6000/_mulkc3.c b/libgcc/config/rs6000/_mulkc3.c
index a88fae21661..c2687bee97b 100644
--- a/libgcc/config/rs6000/_mulkc3.c
+++ b/libgcc/config/rs6000/_mulkc3.c
@@ -35,6 +35,8 @@ typedef __complex float KCtype __attribute__ ((mode (KC)));
 #define __mulkc3 __mulkc3_sw
 #endif
 
+extern KCtype __mulkc3 (KFtype, KFtype, KFtype, KFtype);
+
 KCtype
 __mulkc3 (KFtype a, KFtype b, KFtype c, KFtype d)
 {