diff --git a/RtAudio.cpp b/RtAudio.cpp
index ac6bee92..4a33e9a9 100644
--- a/RtAudio.cpp
+++ b/RtAudio.cpp
@@ -10911,12 +10911,10 @@ unsigned int RtApi :: formatBytes( RtAudioFormat format )
 {
   if ( format == RTAUDIO_SINT16 )
     return 2;
-  else if ( format == RTAUDIO_SINT32 || format == RTAUDIO_FLOAT32 )
+  else if ( format == RTAUDIO_SINT32 || format == RTAUDIO_FLOAT32 || format == RTAUDIO_SINT24)
     return 4;
   else if ( format == RTAUDIO_FLOAT64 )
     return 8;
-  else if ( format == RTAUDIO_SINT24 )
-    return 3;
   else if ( format == RTAUDIO_SINT8 )
     return 1;
 
diff --git a/RtAudio.h b/RtAudio.h
index e767ddb2..17fb5bdc 100644
--- a/RtAudio.h
+++ b/RtAudio.h
@@ -711,7 +711,7 @@ struct CallbackInfo {
 class S24 {
 
  protected:
-  unsigned char c3[3];
+  unsigned char c3[4];
 
  public:
   S24() {}
diff --git a/configure.ac b/configure.ac
index 67dca684..35f9d996 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ AM_INIT_AUTOMAKE([1.14 -Wall -Werror foreign subdir-objects])
 #
 # If any interfaces have been removed since the last public release, then set
 # age to 0.
-m4_define([lt_current], 7)
+m4_define([lt_current], 8)
 m4_define([lt_revision], 0)
 m4_define([lt_age], 0)