diff --git a/libexec/pyenv-version-file-read b/libexec/pyenv-version-file-read
index 7d27d5a5..ae24345c 100755
--- a/libexec/pyenv-version-file-read
+++ b/libexec/pyenv-version-file-read
@@ -9,7 +9,7 @@ if [ -e "$VERSION_FILE" ]; then
   # Read the first non-whitespace word from the specified version file.
   # Be careful not to load it whole in case there's something crazy in it.
   IFS="${IFS}"$'\r'
-  words=($(cut -b 1-1024 "$VERSION_FILE" | sed 's/^\s*\(\S\+\).*/\1/'))
+  words=($(cut -b 1-1024 "$VERSION_FILE" | sed 's/[[:space:]]*\([^[:space:]^[:space:]]*\).*/\1/'))
   versions=("${words[@]}")
 
   if [ -n "$versions" ]; then