diff --git a/oracle/CMakeLists.txt b/oracle/CMakeLists.txt
index 872b4d26..9aa0d9bb 100644
--- a/oracle/CMakeLists.txt
+++ b/oracle/CMakeLists.txt
@@ -11,8 +11,6 @@ SET(oracle_SOURCES
     src/main.cpp
     src/oraclewizard.cpp
     src/oracleimporter.cpp
-    src/zip/unzip.cpp
-    src/zip/zipglobal.cpp
     ../cockatrice/src/carddatabase.cpp
     ../cockatrice/src/settingscache.cpp
     ../cockatrice/src/qt-json/json.cpp
@@ -121,6 +119,12 @@ FIND_PACKAGE(ZLIB)
 IF(ZLIB_FOUND)
     INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIRS})
     ADD_DEFINITIONS("-DHAS_ZLIB")
+
+    set(oracle_SOURCES ${oracle_SOURCES}
+        src/zip/unzip.cpp
+        src/zip/zipglobal.cpp
+    )
+
 ELSE()
     MESSAGE(STATUS "Oracle: zlib not found; ZIP support disabled")
 ENDIF()
diff --git a/oracle/src/oraclewizard.cpp b/oracle/src/oraclewizard.cpp
index ac9dd28b..d50ae585 100644
--- a/oracle/src/oraclewizard.cpp
+++ b/oracle/src/oraclewizard.cpp
@@ -29,11 +29,12 @@
 #include "main.h"
 #include "settingscache.h"
 
+#define ZIP_SIGNATURE "PK"
+#define ALLSETS_URL_FALLBACK "http://mtgjson.com/json/AllSets.json"
+
 #ifdef HAS_ZLIB
     #include "zip/unzip.h"
-    #define ZIP_SIGNATURE "PK"
     #define ALLSETS_URL "http://mtgjson.com/json/AllSets.json.zip"
-    #define ALLSETS_URL_FALLBACK "http://mtgjson.com/json/AllSets.json"
 #else
     #define ALLSETS_URL "http://mtgjson.com/json/AllSets.json"
 #endif