diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0e5616eb..f8a45af9d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,9 +20,9 @@ set(ZIG_LIBC_INCLUDE_DIR "/usr/include" CACHE STRING "Default native target libc
 set(ZIG_DYNAMIC_LINKER "" CACHE STRING "Override dynamic linker for native target")
 set(ZIG_EACH_LIB_RPATH off CACHE BOOL "Add each dynamic library to rpath for native target")
 
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_LIB_DIR_ESCAPED ${ZIG_LIBC_LIB_DIR}) 
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_STATIC_LIB_DIR_ESCAPED ${ZIG_LIBC_STATIC_LIB_DIR}) 
-string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_INCLUDE_DIR_ESCAPED ${ZIG_LIBC_INCLUDE_DIR}) 
+string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_LIB_DIR_ESCAPED "${ZIG_LIBC_LIB_DIR}")
+string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_STATIC_LIB_DIR_ESCAPED "${ZIG_LIBC_STATIC_LIB_DIR}")
+string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_LIBC_INCLUDE_DIR_ESCAPED "${ZIG_LIBC_INCLUDE_DIR}")
 
 option(ZIG_TEST_COVERAGE "Build Zig with test coverage instrumentation" OFF)
 
diff --git a/ci/travis_osx_script b/ci/travis_osx_script
index c53acc0e7..1f345c9c5 100755
--- a/ci/travis_osx_script
+++ b/ci/travis_osx_script
@@ -5,7 +5,7 @@ set -e
 
 mkdir build
 cd build
-cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@5/ -DCMAKE_INSTALL_PREFIX=$(pwd) -DZIG_LIBC_INCLUDE_DIR=/usr/include
+cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@5/ -DCMAKE_INSTALL_PREFIX=$(pwd)
 make VERBOSE=1
 make install