diff --git a/libs/openzap/src/include/libteletone.h b/libs/openzap/src/include/libteletone.h
index 5c9616cb2a..5bb38b5c37 100644
--- a/libs/openzap/src/include/libteletone.h
+++ b/libs/openzap/src/include/libteletone.h
@@ -78,7 +78,7 @@ extern "C" {
 #define TELETONE_MAX_TONES 6
 #define TELETONE_TONE_RANGE 127
 
-typedef float teletone_process_t;
+typedef double teletone_process_t;
 
 /*! \file libteletone.h
     \brief Top level include file