diff --git a/src/sfloader/fluid_defsfont.c b/src/sfloader/fluid_defsfont.c
index 78f8f493..24112d00 100644
--- a/src/sfloader/fluid_defsfont.c
+++ b/src/sfloader/fluid_defsfont.c
@@ -693,7 +693,6 @@ fluid_defpreset_next(fluid_defpreset_t *defpreset)
 }
 
 #ifdef DEBUG
-void fluid_print_voice_mod(fluid_voice_t  *voice);
 
 /*
  Prints all the voice modulators of an instrument zone.
diff --git a/src/synth/fluid_voice.c b/src/synth/fluid_voice.c
index 6065a2b8..042380a3 100644
--- a/src/synth/fluid_voice.c
+++ b/src/synth/fluid_voice.c
@@ -2213,12 +2213,7 @@ void fluid_voice_set_custom_filter(fluid_voice_t *voice, enum fluid_iir_filter_t
     UPDATE_RVOICE_GENERIC_I2(fluid_iir_filter_init, &voice->rvoice->resonant_custom_filter, type, flags);
 }
 
-#ifdef DEBUG
-/*
- Prints all the voice modulators.
-
- @param voice voice
-*/
+/* Prints all the voice modulators. */
 void fluid_print_voice_mod(fluid_voice_t  *voice)
 {
     int i, mod_idx;
@@ -2291,5 +2286,3 @@ fluid_mod_t *fluid_voice_get_modulator(fluid_voice_t *voice, int mod_idx)
     }
     return NULL;
 }
-
-#endif
diff --git a/src/synth/fluid_voice.h b/src/synth/fluid_voice.h
index 599a0e28..d4216087 100644
--- a/src/synth/fluid_voice.h
+++ b/src/synth/fluid_voice.h
@@ -194,4 +194,8 @@ fluid_real_t fluid_voice_gen_value(const fluid_voice_t *voice, int num);
 void fluid_voice_set_custom_filter(fluid_voice_t *voice, enum fluid_iir_filter_type type, enum fluid_iir_filter_flags flags);
 
 
+void fluid_print_voice_mod(fluid_voice_t *voice);
+int fluid_voice_get_count_modulators(fluid_voice_t *voice);
+fluid_mod_t *fluid_voice_get_modulator(fluid_voice_t *voice, int mod_idx);
+
 #endif /* _FLUID_VOICE_H */
diff --git a/test/test_fluid_voice_add.c b/test/test_fluid_voice_add.c
index 8aff1c84..167ac788 100644
--- a/test/test_fluid_voice_add.c
+++ b/test/test_fluid_voice_add.c
@@ -10,12 +10,6 @@ FLUID_VOICE_DEFAULT, FLUID_VOICE_ADD, FLUID_VOICE_OVERWRITE.
 #include "synth/fluid_voice.h"
 #include "synth/fluid_chan.h"
 
-//----------------------------------------------------------------------------
-/* external functions */
-void fluid_print_voice_mod(fluid_voice_t  *voice);
-int fluid_voice_get_count_modulators(fluid_voice_t *voice);
-fluid_mod_t *fluid_voice_get_modulator(fluid_voice_t *voice, int mod_idx);
-
 //----------------------------------------------------------------------------
 static int fluid_compare_mod_structure(fluid_mod_t *mod1, fluid_mod_t *mod2);