diff --git a/mozilla/configure.in b/mozilla/configure.in
index 7e44c6fe484..e7b20ef647d 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -915,6 +915,7 @@ case "$target" in
         AC_DEFINE(XP_OS2_VACPP)
         AC_DEFINE(TCPV40HDRS)
         AC_DEFINE(NSCAP_DISABLE_DEBUG_PTR_TYPES)
+        AC_DEFINE(STDC_HEADERS)
         MOZ_COMPONENT_NSPR_LIBS='$(NSPR_LIBS)'
         MKSHLIB='$(LD) $(DSO_LDOPTS)'
         MKCSHLIB='$(LD) $(DSO_LDOPTS)'