diff --git a/configure.in b/configure.in
index 020e6483..a9e625b1 100644
--- a/configure.in
+++ b/configure.in
@@ -53,6 +53,7 @@ dnl Checks for structures.
 
 dnl Checks for compiler characteristics.
 AC_C_CONST
+AC_C_INLINE
 AM_C_PROTOTYPES
 
 dnl Checks for library functions.