diff --git a/.travis.yml b/.travis.yml
index d93039a..c6d1d93 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -93,7 +93,11 @@ matrix:
     - compiler: gcc
 
 before_install:
-  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew update; fi
+  - |
+      if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+        brew update
+        brew install pcre
+      fi
   - |
       if [ "$TRAVIS_OS_NAME" = "osx" ] && [ "$CC" = "clang" ]; then
         brew unlink cmake