diff --git a/configure.ac b/configure.ac
index abe86ede5..14edcc3bd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ AC_SUBST(HB_VERSION)
 
 # Libtool version
 m4_define([hb_version_int],
-	  m4_eval(hb_version_major*10000 + hb_version_minor*100 + hb_version_micro))
+	  m4_eval(60000 + hb_version_major*100 + hb_version_minor*10 + hb_version_micro))
 HB_LIBTOOL_VERSION_INFO=hb_version_int:0:hb_version_int
 AC_SUBST(HB_LIBTOOL_VERSION_INFO)
 
diff --git a/meson.build b/meson.build
index cc802f2f5..947c371da 100644
--- a/meson.build
+++ b/meson.build
@@ -14,7 +14,7 @@ hb_version_minor = hb_version_arr[1].to_int()
 hb_version_micro = hb_version_arr[2].to_int()
 
 # libtool versioning
-hb_version_int = hb_version_major*10000 + hb_version_minor*100 + hb_version_micro
+hb_version_int = 60000 + hb_version_major*100 + hb_version_minor*10 + hb_version_micro
 hb_libtool_version_info = '@0@:0:@0@'.format(hb_version_int)
 
 pkgmod = import('pkgconfig')