diff --git a/libphobos/configure b/libphobos/configure
index 4c1116d6f800..de6d367911a7 100755
--- a/libphobos/configure
+++ b/libphobos/configure
@@ -15501,7 +15501,7 @@ SPEC_PHOBOS_DEPS="$LIBS"
 
 
 # Libdruntime / phobos soname version
-libtool_VERSION=1:0:0
+libtool_VERSION=2:0:0
 
 
 # Set default flags (after DRUNTIME_WERROR!)
diff --git a/libphobos/configure.ac b/libphobos/configure.ac
index bf21128bd509..60aee3ffe8b5 100644
--- a/libphobos/configure.ac
+++ b/libphobos/configure.ac
@@ -256,7 +256,7 @@ SPEC_PHOBOS_DEPS="$LIBS"
 AC_SUBST(SPEC_PHOBOS_DEPS)
 
 # Libdruntime / phobos soname version
-libtool_VERSION=1:0:0
+libtool_VERSION=2:0:0
 AC_SUBST(libtool_VERSION)
 
 # Set default flags (after DRUNTIME_WERROR!)