diff --git a/aegisub/libaegisub/Makefile.am b/aegisub/libaegisub/Makefile.am
index f91143f1a..19d14ad42 100644
--- a/aegisub/libaegisub/Makefile.am
+++ b/aegisub/libaegisub/Makefile.am
@@ -4,7 +4,7 @@ AM_CXXFLAGS=
 DISTCLEANFILES=
 
 lib_LTLIBRARIES = libaegisub-2.2.la
-libaegisub_2_2_la_CPPFLAGS = -I../src/include -Iinclude -I. @WX_CPPFLAGS@
+libaegisub_2_2_la_CPPFLAGS = -I../src/include -Iinclude -I. @WX_CPPFLAGS@ -ansi -pedantic
 libaegisub_2_2_la_LDFLAGS = @ICONV_LDFLAGS@
 
 if PRECOMPILED_HEADER