diff --git a/configure.ac b/configure.ac
index 454a0280..18f48776 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,7 @@ AC_ENABLE_SHARED
 AC_ENABLE_STATIC
 AC_PROG_CC
 AM_PROG_CC_C_O
+CC_CHECK_CFLAGS_APPEND([-Wno-dollar-in-identifier-extension])
 # AM_PROG_AR is not available in automake v0.11 but it's essential in v0.12.
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])