diff --git a/update-version-number b/update-version-number
index 795ff283c..1dfdc583e 100755
--- a/update-version-number
+++ b/update-version-number
@@ -20,7 +20,7 @@ sed -b -i "s/VERSION \"\([0-9.]\+\)\"/VERSION \"${ver}\"/g" vs/config_package.h
 
 sed -b -i "s/^AC_INIT(dosbox-x,\([0-9.]\+\)/AC_INIT(dosbox-x,${ver}/" configure.ac
 
-sed -b -i "s/^#define MyAppVersion \"\([0-9.]\+\)\"/#define MyAppVersion \"${ver}\"/" contrib/windows/installer/DOSBox-X-setup.iss
+find contrib/windows/installer -type f -name '*.iss' -exec sed -b -i "s/^#define MyAppVersion \"\([0-9.]\+\)\"/#define MyAppVersion \"${ver}\"/" {} +
 
 ver=$(echo "${ver}" | tr . ,)