diff --git a/pyenv.d/exec/pip-rehash.bash b/pyenv.d/exec/pip-rehash.bash
index f3687566..a90317fa 100644
--- a/pyenv.d/exec/pip-rehash.bash
+++ b/pyenv.d/exec/pip-rehash.bash
@@ -2,7 +2,7 @@ PYENV_PIP_REHASH_ROOT="${BASH_SOURCE[0]%/*}/pip-rehash"
 PYENV_REHASH_COMMAND="${PYENV_COMMAND##*/}"
 
 # Remove any version information, from e.g. "pip2" or "pip3.4".
-if [[ $PYENV_REHASH_COMMAND =~ ^(pip|easy_install)[23](\.\d)?$ ]]; then
+if [[ $PYENV_REHASH_COMMAND =~ ^(pip|easy_install)[23](\.[0-9]+)?$ ]]; then
   PYENV_REHASH_COMMAND="${BASH_REMATCH[1]}"
 fi