diff --git a/CMakeLists.txt b/CMakeLists.txt
index 20ca376e5..1ddfa261d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -284,7 +284,9 @@ if((NOT ZM_NO_CRASHTRACE) AND ((NOT HAVE_DECL_BACKTRACE) OR (NOT HAVE_EXECINFO_H
 endif((NOT ZM_NO_CRASHTRACE) AND ((NOT HAVE_DECL_BACKTRACE) OR (NOT HAVE_EXECINFO_H)))
 
 
+set(ZM_MEM_MAPPED 0)
 if(NOT ZM_NO_MMAP)
+	set(ZM_MEM_MAPPED 1)
 	set(ZM_MMAP_PERLPACKAGE "Sys::Mmap")
 endif(NOT ZM_NO_MMAP)
 # Check for Perl. Version checking is removed because its ignored before CMake 2.8.8 and it seems that Perl is being detected as 5.16. instead of 5.6.0 ??
diff --git a/zoneminder-config.cmake b/zoneminder-config.cmake
index 3464d14a0..5011b6ce8 100644
--- a/zoneminder-config.cmake
+++ b/zoneminder-config.cmake
@@ -58,6 +58,9 @@
 #cmakedefine HAVE_DECL_MD5 1
 #cmakedefine HAVE_DECL_GNUTLS_FINGERPRINT 1
 
+/* Few ZM options that are needed by the source code */
+#cmakedefine ZM_MEM_MAPPED 1
+
 /* Its safe to assume that signal return type is void. This is a fix for zm_signal.h */
 #define RETSIGTYPE void