diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 5bc892aa..d5be930d 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -23,7 +23,7 @@ add_subdirectory(mms_client_example3)
 add_subdirectory(mms_client_example4)
 
 IF(WIN32)
-if(EXISTS "../third_party/winpcap/Lib/wpcap.lib")
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../third_party/winpcap/Lib/wpcap.lib")
 message("Found winpcap -> compile examples for GOOSE and SV")
 add_subdirectory(server_example_goose)
 add_subdirectory(goose_subscriber)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4b4b8011..31a74e92 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -205,7 +205,7 @@ set (lib_bsd_SRCS
 
 IF(WIN32)
 
-if(EXISTS "../third_party/winpcap/Lib/wpcap.lib")
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../third_party/winpcap/Lib/wpcap.lib")
 message("Found winpcap -> can compile with GOOSE support")
 set(WITH_WPCAP 1)
 endif()