diff --git a/external/miniupnpc/CMakeLists.txt b/external/miniupnpc/CMakeLists.txt
index bc9685699..2df8d474b 100644
--- a/external/miniupnpc/CMakeLists.txt
+++ b/external/miniupnpc/CMakeLists.txt
@@ -73,6 +73,13 @@ if (CMAKE_COMPILER_IS_GNUC)
 endif ()
 endif()
 
+# always add -fPIC
+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fPIC")
+set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -fPIC")
+set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -fPIC")
+set (CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} -fPIC")
+
 configure_file (${CMAKE_CURRENT_SOURCE_DIR}/miniupnpcstrings.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/miniupnpcstrings.h)
 include_directories (${CMAKE_CURRENT_BINARY_DIR})