diff --git a/mono/btls/CMakeLists.txt b/mono/btls/CMakeLists.txt
index 7e5e84f..8734b71 100644
--- a/mono/btls/CMakeLists.txt
+++ b/mono/btls/CMakeLists.txt
@@ -24,8 +24,12 @@ if (NOT "${BTLS_ARCH}" STREQUAL "")
 endif ()
 if (BUILD_DYNAMIC_BTLS)
 	set (CMAKE_POSITION_INDEPENDENT_CODE TRUE)
-endif ()
-set (C_CXX_FLAGS "-Wall -Wsign-compare -Wmissing-field-initializers -ggdb -fvisibility=hidden")
+	set (C_CXX_FLAGS "-Wall -Wsign-compare -Wmissing-field-initializers -fPIC -ggdb -fvisibility=hidden")
+elseif (BUILD_SHARED_LIBS)
+	set (C_CXX_FLAGS "-Wall -Wsign-compare -Wmissing-field-initializers -fPIC -ggdb -fvisibility=hidden")
+else ()
+	set (C_CXX_FLAGS "-Wall -Wsign-compare -Wmissing-field-initializers -ggdb -fvisibility=hidden")
+endif()
 set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_CXX_FLAGS} ${BTLS_CFLAGS}")
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${C_CXX_FLAGS} ${BTLS_CFLAGS}")
 set (CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${BTLS_CFLAGS}")