diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f8cb91a..555a4f1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -114,7 +114,11 @@ endif()
 
 
 # Change Global Definitions depending on how you want to use the library
-target_compile_definitions(qzxing PUBLIC DISABLE_LIBRARY_FEATURES)
+if(BUILD_SHARED_LIBS)
+    target_compile_definitions(qzxing PUBLIC $<BUILD_INTERFACE:QZXING_LIBRARY>)
+else()
+    target_compile_definitions(qzxing PUBLIC DISABLE_LIBRARY_FEATURES)
+endif()
 
 # Target includes
 target_include_directories(qzxing