diff -urN b/iso2mb.c c/iso2mb.c
--- b/iso2mb.c	2015-07-06 21:38:49.129658661 +0000
+++ c/iso2mb.c	2015-07-07 18:50:17.211540572 +0000
@@ -513,11 +513,11 @@
   return wc;
 }
 
-mb_wchar_t
+__attribute__ ((gnu_inline)) __inline__ mb_wchar_t
 mb_encode_to_wchar(mb_info_t *info)
 MB_ENCODE_TO_WCHAR
 
-mb_wchar_t
+__attribute__ ((gnu_inline)) __inline__ mb_wchar_t
 mb_fetch_wchar(mb_info_t *info)
 MB_FETCH_WCHAR
 
diff -urN b/mb2iso.c c/mb2iso.c
--- b/mb2iso.c	2015-07-06 21:38:49.133658683 +0000
+++ c/mb2iso.c	2015-07-07 19:07:47.583244156 +0000
@@ -900,7 +900,7 @@
   return n;
 }
 
-size_t
+__attribute__ ((gnu_inline)) __inline__ size_t
 mb_store_wchar(mb_wchar_t enc, mb_info_t *info)
 MB_STORE_WCHAR
 
diff -urN b/mb.h c/mb.h
--- b/mb.h	2015-07-06 21:38:49.133658683 +0000
+++ c/mb.h	2015-07-07 18:50:17.211540572 +0000
@@ -434,7 +434,7 @@
 }
 
 #ifdef __GNUC__
-extern __inline__ mb_wchar_t mb_encode_to_wchar(mb_info_t *info) MB_ENCODE_TO_WCHAR
+extern __attribute__ ((gnu_inline))  __inline__ mb_wchar_t mb_encode_to_wchar(mb_info_t *info);
 #else
 extern mb_wchar_t mb_encode_to_wchar(mb_info_t *info);
 #endif
@@ -449,7 +449,7 @@
 }
 
 #ifdef __GNUC__
-extern __inline__ mb_wchar_t mb_fetch_wchar(mb_info_t *info) MB_FETCH_WCHAR
+extern __attribute__ ((gnu_inline))  __inline__ mb_wchar_t mb_fetch_wchar(mb_info_t *info);
 #else
 extern mb_wchar_t mb_fetch_wchar(mb_info_t *info);
 #endif
@@ -552,7 +552,7 @@
 }
 
 #ifdef __GNUC__
-extern __inline__ size_t mb_store_wchar(mb_wchar_t enc, mb_info_t *info) MB_STORE_WCHAR
+extern __attribute__ ((gnu_inline)) __inline__ size_t mb_store_wchar(mb_wchar_t enc, mb_info_t *info);
 #else
 extern size_t mb_store_wchar(mb_wchar_t enc, mb_info_t *info);
 #endif