diff --git a/CMakeLists.txt b/CMakeLists.txt
index df47125..42a2969 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,9 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
 find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
 
-add_library(XISF SHARED
+option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
+
+add_library(XISF
   libXISF_global.h
   libxisf.cpp
   libxisf.h
@@ -26,7 +28,10 @@ set_target_properties(XISF PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION ${PRO
 
 target_link_libraries(XISF PUBLIC Qt${QT_VERSION_MAJOR}::Core)
 
-target_compile_definitions(XISF PRIVATE LIBXISF_LIBRARY)
+if(BUILD_SHARED_LIBS)
+    target_compile_definitions(XISF PRIVATE LIBXISF_LIBRARY)
+    target_compile_definitions(XISF LIBXISF_SHARED_LIB)
+endif(BUILD_SHARED_LIBS)
 
 set(XISF_PUBLIC_HEADERS libxisf.h libXISF_global.h)
 
diff --git a/libXISF_global.h b/libXISF_global.h
index 2637a73..3b211b5 100644
--- a/libXISF_global.h
+++ b/libXISF_global.h
@@ -21,10 +21,14 @@
 
 #include <QtCore/qglobal.h>
 
-#if defined(LIBXISF_LIBRARY)
-#  define LIBXISF_EXPORT Q_DECL_EXPORT
+#ifdef LIBXISF_SHARED_LIB
+#  if defined(LIBXISF_LIBRARY)
+#    define LIBXISF_EXPORT Q_DECL_EXPORT
+#  else
+#    define LIBXISF_EXPORT Q_DECL_IMPORT
+#  endif
 #else
-#  define LIBXISF_EXPORT Q_DECL_IMPORT
+#  define LIBXISF_EXPORT
 #endif
 
 #endif // LIBXISF_GLOBAL_H