diff --git a/configure.ac b/configure.ac
index dd3752be..185433c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,7 +42,6 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CC_C99
-AM_PROG_CC_C_O
 
 # Initialize libtool
 LT_PREREQ([2.2])