diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec7b501..8dec80d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,7 +115,9 @@ if(NOT DEFINED ESPEAK_NG_DIR)
         CMAKE_ARGS -DUSE_SPEECHPLAYER:BOOL=OFF
         CMAKE_ARGS -DEXTRA_cmn:BOOL=ON
         CMAKE_ARGS -DEXTRA_ru:BOOL=ON
-        CMAKE_ARGS -DCMAKE_C_FLAGS="-D_FILE_OFFSET_BITS=64"
+        CMAKE_ARGS -DCMAKE_C_FLAGS="-D_FILE_OFFSET_BITS=64 -fPIC"
+        CMAKE_ARGS -DCMAKE_CXX_FLAGS="-fPIC"
+        CMAKE_ARGS -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     )
     add_dependencies(piper_phonemize espeak_ng_external)
 endif()