diff --git a/modules/pam_deny/Makefile.am b/modules/pam_deny/Makefile.am
index 19cd3da..5bb33c3 100644
--- a/modules/pam_deny/Makefile.am
+++ b/modules/pam_deny/Makefile.am
@@ -6,5 +6,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/include
 pkglib_LTLIBRARIES = pam_deny.la
 
 pam_deny_la_SOURCES = pam_deny.c
-pam_deny_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@
+pam_deny_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@ \
+	-export-symbols-regex '^pam_sm_'
 pam_deny_la_LIBADD = $(top_builddir)/lib/libpam.la
diff --git a/modules/pam_permit/Makefile.am b/modules/pam_permit/Makefile.am
index f985a73..b1dcd13 100644
--- a/modules/pam_permit/Makefile.am
+++ b/modules/pam_permit/Makefile.am
@@ -6,5 +6,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/include
 pkglib_LTLIBRARIES = pam_permit.la
 
 pam_permit_la_SOURCES = pam_permit.c
-pam_permit_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@
+pam_permit_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@ \
+	-export-symbols-regex '^pam_sm_'
 pam_permit_la_LIBADD = $(top_builddir)/lib/libpam.la
diff --git a/modules/pam_unix/Makefile.am b/modules/pam_unix/Makefile.am
index 8c50d3c..78e3671 100644
--- a/modules/pam_unix/Makefile.am
+++ b/modules/pam_unix/Makefile.am
@@ -7,6 +7,7 @@ if WITH_PAM_UNIX
 pkglib_LTLIBRARIES = pam_unix.la
 
 pam_unix_la_SOURCES = pam_unix.c
-pam_unix_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@
+pam_unix_la_LDFLAGS = -no-undefined -module -version-info @LIB_MAJ@ \
+	-export-symbols-regex '^pam_sm_'
 pam_unix_la_LIBADD = $(top_builddir)/lib/libpam.la @CRYPT_LIBS@
 endif