diff --git a/ffmpeg-shared-build-cywin32.sh b/ffmpeg-shared-build-cywin32.sh
index 358a346..9c3e8f1 100755
--- a/ffmpeg-shared-build-cywin32.sh
+++ b/ffmpeg-shared-build-cywin32.sh
@@ -141,6 +141,7 @@ apt-cyg install libgc-devel
 apt-cyg install autoconf
 apt-cyg install libtool
 apt-cyg install ninja
+apt-cyg install libiconv-devel
 
 # Build x264
 if [ -f /usr/lib/pkgconfig/x264.pc ] ; then
diff --git a/ffmpeg-shared-build-cywin64.sh b/ffmpeg-shared-build-cywin64.sh
index 071cb60..42fbaf1 100755
--- a/ffmpeg-shared-build-cywin64.sh
+++ b/ffmpeg-shared-build-cywin64.sh
@@ -141,6 +141,7 @@ apt-cyg install libgc-devel
 apt-cyg install autoconf
 apt-cyg install libtool
 apt-cyg install ninja
+apt-cyg install libiconv-devel
 
 # Build x264
 if [ -f /usr/lib/pkgconfig/x264.pc ] ; then