diff --git a/library_builders.sh b/library_builders.sh
index bfbcd128..d3525659 100644
--- a/library_builders.sh
+++ b/library_builders.sh
@@ -18,6 +18,7 @@ BZIP2_VERSION="${BZIP2_VERSION:-1.0.7}"
 FREETYPE_VERSION="${FREETYPE_VERSION:-2.11.0}"
 TIFF_VERSION="${TIFF_VERSION:-4.1.0}"
 JPEG_VERSION="${JPEG_VERSION:-9b}"
+JPEGTURBO_VERSION="${JPEGTURBO_VERSION:-2.1.3}"
 OPENJPEG_VERSION="${OPENJPEG_VERSION:-2.1}"
 LCMS2_VERSION="${LCMS2_VERSION:-2.9}"
 GIFLIB_VERSION="${GIFLIB_VERSION:-5.1.3}"