diff --git a/src/parselmouth.cpp b/src/parselmouth.cpp
index 7a4cf2dc..8747e636 100644
--- a/src/parselmouth.cpp
+++ b/src/parselmouth.cpp
@@ -35,7 +35,6 @@ Thing_declare(Daata);
 Thing_declare(Formant);
 Thing_declare(Function);
 Thing_declare(Harmonicity);
-Thing_declare(Harmonicity);
 Thing_declare(Intensity);
 Thing_declare(Matrix);
 Thing_declare(MFCC);