diff --git a/lib/libzdb/Makefile.am b/lib/libzdb/Makefile.am
index 5e070db632..ec4fd92b98 100644
--- a/lib/libzdb/Makefile.am
+++ b/lib/libzdb/Makefile.am
@@ -1,4 +1,5 @@
-libzdb_la_CFLAGS = $(AM_CFLAGS) $(KERNEL_CFLAGS) $(LIBRARY_CFLAGS)
+libzdb_la_CFLAGS = $(AM_CFLAGS) $(LIBRARY_CFLAGS)
+libzdb_la_CFLAGS += -fvisibility=hidden
 
 noinst_LTLIBRARIES += libzdb.la