diff --git a/aegisub/configure.in b/aegisub/configure.in
index 7b1483f6f..11ecfa407 100644
--- a/aegisub/configure.in
+++ b/aegisub/configure.in
@@ -41,7 +41,6 @@ AM_INIT_AUTOMAKE
 AC_CONFIG_HEADER([acconf.h])
 AC_GNU_SOURCE
 AC_CANONICAL_HOST
-AM_PROG_CC_C_O
 
 ###########################
 # Check target architecture
@@ -185,6 +184,7 @@ CHECK_GNU_MAKE
 AC_PROG_CC
 AC_PROG_CXX
 AC_LANG(C++)
+AM_PROG_CC_C_O
 define([AC_LIBTOOL_LANG_F77_CONFIG], [:])
 AC_PROG_LIBTOOL
 AC_PROG_INSTALL