diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a945419b..306354f7b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1037,6 +1037,10 @@ else()
 	set(PRIVATE_KEYWORD "PRIVATE")
 endif()
 
+if(BUILD_SHARED_LIBS)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWINPR_DLL")
+endif()
+
 add_subdirectory(winpr)
 
 # Sub-directories
diff --git a/winpr/CMakeLists.txt b/winpr/CMakeLists.txt
index ab9d8cd35..2da25a426 100644
--- a/winpr/CMakeLists.txt
+++ b/winpr/CMakeLists.txt
@@ -158,6 +158,10 @@ if(NOT DEFINED BUILD_SHARED_LIBS)
 	set(BUILD_SHARED_LIBS ON)
 endif()
 
+if(BUILD_SHARED_LIBS)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWINPR_DLL")
+endif()
+
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWINPR_EXPORTS")
 
 # Enable 64bit file support on linux and FreeBSD.
diff --git a/winpr/include/winpr/winpr.h b/winpr/include/winpr/winpr.h
index 9961e985e..a2da2001d 100644
--- a/winpr/include/winpr/winpr.h
+++ b/winpr/include/winpr/winpr.h
@@ -21,6 +21,7 @@
 
 #include <winpr/platform.h>
 
+#ifdef WINPR_DLL
 #if defined _WIN32 || defined __CYGWIN__
 #ifdef WINPR_EXPORTS
 #ifdef __GNUC__
@@ -42,6 +43,9 @@
 #define WINPR_API
 #endif
 #endif
+#else /* WINPR_DLL */
+#define WINPR_API	
+#endif
 
 /* Thread local storage keyword define */
 #if defined _WIN32 || defined __CYGWIN__