diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e42fd9..5834468 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ option(LIBICSNEO_BUILD_DOCS "Build documentation. Don't use in Visual Studio." O
 option(LIBICSNEO_BUILD_ICSNEOC "Build dynamic C library" ON)
 option(LIBICSNEO_BUILD_ICSNEOC_STATIC "Build static C library" ON)
 option(LIBICSNEO_BUILD_ICSNEOLEGACY "Build icsnVC40 compatibility library" ON)
+set(LIBICSNEO_NPCAP_INCLUDE_DIR "" CACHE STRING "Npcap include directory; set to build with Npcap")
 
 set(CMAKE_CXX_STANDARD 11)
 
@@ -182,8 +183,13 @@ endif(NOT WIN32)
 
 # winpcap
 if(WIN32)
-	target_include_directories(icsneocpp PUBLIC AFTER third-party/winpcap/include)
-	add_definitions(-DWPCAP -DHAVE_REMOTE -DWIN32_LEAN_AND_MEAN)
+	if(LIBICSNEO_NPCAP_INCLUDE_DIR STREQUAL "")
+		target_include_directories(icsneocpp PUBLIC AFTER third-party/winpcap/include)
+		add_definitions(-DWPCAP -DHAVE_REMOTE -DWIN32_LEAN_AND_MEAN)
+	else()
+		target_include_directories(icsneocpp PUBLIC AFTER ${LIBICSNEO_NPCAP_INCLUDE_DIR})
+		add_definitions(-DNPCAP -DWIN32_LEAN_AND_MEAN)
+	endif()
 endif(WIN32)
 
 if(LIBICSNEO_BUILD_ICSNEOC)
diff --git a/platform/windows/internal/pcapdll.cpp b/platform/windows/internal/pcapdll.cpp
index 6b02802..77a15a1 100644
--- a/platform/windows/internal/pcapdll.cpp
+++ b/platform/windows/internal/pcapdll.cpp
@@ -27,6 +27,21 @@ bool PCAPDLL::ok() const
 
 PCAPDLL::PCAPDLL() 
 {
+#ifdef NPCAP
+	BOOL(WINAPI * SetDllDirectory)(LPCTSTR);
+	char sysdir_name[512];
+	int len;
+	SetDllDirectory = (BOOL(WINAPI*)(LPCTSTR)) GetProcAddress(GetModuleHandle("kernel32.dll"), "SetDllDirectoryA");
+	if (SetDllDirectory != NULL)
+	{
+		len = GetSystemDirectory(sysdir_name, 480);	//	be safe
+		if (len)
+		{
+			strcat(sysdir_name, "\\Npcap");
+			SetDllDirectory(sysdir_name);
+		}
+	}
+#endif
 	dll = LoadLibrary("wpcap.dll");
 
 	if(dll == NULL) {