diff --git a/configure.in b/configure.in
index b40c62b4..fba5d323 100644
--- a/configure.in
+++ b/configure.in
@@ -62,6 +62,7 @@ AC_PROG_INSTALL
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
+AC_C_INLINE
 AC_C_RESTRICT
 AC_TYPE_SIZE_T
 PA_WORKING_BOOL