diff --git a/deepspeech/decoders/swig/ctc_beam_search_decoder.cpp b/deepspeech/decoders/swig/ctc_beam_search_decoder.cpp
index fc5fe62da01a7da2c2506220b2820d6cf696d95b..1a37dd1cefbad0082b0ca9d222a71731dd07145b 100644
--- a/deepspeech/decoders/swig/ctc_beam_search_decoder.cpp
+++ b/deepspeech/decoders/swig/ctc_beam_search_decoder.cpp
@@ -28,7 +28,7 @@
 #include "path_trie.h"
 
 using FSTMATCH = fst::SortedMatcher<fst::StdVectorFst>;
-constexpr kSPACE = "<space>"
+const std::string kSPACE = "<space>";
 
 std::vector<std::pair<double, std::string>> ctc_beam_search_decoder(
     const std::vector<std::vector<double>> &probs_seq,