diff --git a/gsi/proxy/proxy_core/source/configure.ac b/gsi/proxy/proxy_core/source/configure.ac
index 8d96206bb..cc2a4a2f6 100644
--- a/gsi/proxy/proxy_core/source/configure.ac
+++ b/gsi/proxy/proxy_core/source/configure.ac
@@ -1,6 +1,6 @@
 AC_PREREQ([2.60])
 
-AC_INIT([globus_gsi_proxy_core],[9.8],[https://github.com/gridcf/gct/issues])
+AC_INIT([globus_gsi_proxy_core],[9.9],[https://github.com/gridcf/gct/issues])
 AC_CONFIG_MACRO_DIR([m4])
 AC_SUBST([MAJOR_VERSION], [${PACKAGE_VERSION%%.*}])
 AC_SUBST([MINOR_VERSION], [${PACKAGE_VERSION##*.}])
@@ -50,6 +50,7 @@ if test "$use_symbol_versions" = yes; then
     AC_DEFINE(USE_SYMBOL_VERSIONS, 1, [Use backward-compatibility symbol versioning])
 fi
 
+AM_CONDITIONAL(USES_LTO, [echo $CFLAGS | grep -q -- -flto])
 
 AC_PATH_PROGS([DOXYGEN], doxygen)
 AM_CONDITIONAL([ENABLE_DOXYGEN], [test "$DOXYGEN" != ""])
@@ -58,8 +59,8 @@ AC_OUTPUT(
         globus-gsi-proxy-core.pc
         globus-gsi-proxy-core-uninstalled.pc
         Makefile
-	library/Makefile
+        library/Makefile
         library/Doxyfile
         test/Makefile
-	version.h
+        version.h
 )
diff --git a/gsi/proxy/proxy_core/source/library/Makefile.am b/gsi/proxy/proxy_core/source/library/Makefile.am
index 3b7acf0af..0adefa473 100644
--- a/gsi/proxy/proxy_core/source/library/Makefile.am
+++ b/gsi/proxy/proxy_core/source/library/Makefile.am
@@ -9,9 +9,12 @@ libglobus_gsi_proxy_core_la_CPPFLAGS = \
 libglobus_gsi_proxy_core_la_LIBADD = $(PACKAGE_DEP_LIBS) $(OPENSSL_LIBS)
 libglobus_gsi_proxy_core_la_LDFLAGS = \
 	-version-info $(MAJOR_VERSION):$(MINOR_VERSION):$(AGE_VERSION) \
-        -no-undefined
+	-no-undefined
 if USE_SYMBOL_VERSIONS
 libglobus_gsi_proxy_core_la_LDFLAGS += -Wl,--version-script,$(srcdir)/sym
+if USES_LTO
+libglobus_gsi_proxy_core_la_LDFLAGS += -flto-partition=none
+endif
 endif
 
 libglobus_gsi_proxy_core_la_SOURCES = \
diff --git a/packaging/debian/globus-gsi-proxy-core/debian/changelog.in b/packaging/debian/globus-gsi-proxy-core/debian/changelog.in
index 0baf49bf9..01f88c2a0 100644
--- a/packaging/debian/globus-gsi-proxy-core/debian/changelog.in
+++ b/packaging/debian/globus-gsi-proxy-core/debian/changelog.in
@@ -1,3 +1,9 @@
+globus-gsi-proxy-core (9.9-1+gct.@distro@) @distro@; urgency=medium
+
+  * Fix linking error with gcc 16
+
+ -- Mattias Ellert <mattias.ellert@physics.uu.se>  Thu, 08 Jan 2026 12:54:27 +0100
+
 globus-gsi-proxy-core (9.8-1+gct.@distro@) @distro@; urgency=medium
 
   * Fix some compiler warnings
diff --git a/packaging/fedora/globus-gsi-proxy-core.spec b/packaging/fedora/globus-gsi-proxy-core.spec
index b06588871..d6ed21739 100644
--- a/packaging/fedora/globus-gsi-proxy-core.spec
+++ b/packaging/fedora/globus-gsi-proxy-core.spec
@@ -3,7 +3,7 @@
 Name:		globus-gsi-proxy-core
 %global soname 0
 %global _name %(echo %{name} | tr - _)
-Version:	9.8
+Version:	9.9
 Release:	1%{?dist}
 Summary:	Grid Community Toolkit - Globus GSI Proxy Core Library
 
@@ -143,6 +143,9 @@ make %{?_smp_mflags} check VERBOSE=1
 %doc %{_pkgdocdir}/GLOBUS_LICENSE
 
 %changelog
+* Thu Jan 08 2026 Mattias Ellert <mattias.ellert@physics.uu.se> - 9.9-1
+- Fix linking error with gcc 16
+
 * Thu Mar 10 2022 Mattias Ellert <mattias.ellert@physics.uu.se> - 9.8-1
 - Fix some compiler warnings