diff --git a/configure.ac b/configure.ac
index d765894e..0de08420 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,7 @@ AC_ENABLE_SHARED
 AC_ENABLE_STATIC
 AC_PROG_CC
 AM_PROG_CC_C_O
+CC_CHECK_CFLAGS_APPEND([-fvisibility=hidden])
 CC_CHECK_CFLAGS_APPEND([-g])
 CC_CHECK_CFLAGS_APPEND([-std=gnu89])
 CC_CHECK_CFLAGS_APPEND([-pedantic])