diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ae78b25..e1d8fa0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -67,7 +67,7 @@ if (UNIX)
     RESULT_VARIABLE UNIX_PS_CODE
     OUTPUT_VARIABLE UNIX_PS_STDOUT)
   if (UNIX_PS_CODE EQUAL 0)
-    set (CAL_PAGE_SIZE "${UNIX_PS_STDOUT}")
+    string (STRIP "${UNIX_PS_STDOUT}" CAL_PAGE_SIZE)
   endif ()
 endif (UNIX)
 if (NOT DEFINED CAL_PAGE_SIZE)