diff --git a/ChangeLog b/ChangeLog
index 65587e10..b0a0bc5e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-09-16  Erik de Castro Lopo  <erikd AT mega-nerd DOT com>
+
+    * src/caf.c
+    Use the correct C99 format specifier for int64_t.
+
 2009-09-15  Erik de Castro Lopo  <erikd AT mega-nerd DOT com>
 
     * src/aiff.c src/wav.c
diff --git a/src/caf.c b/src/caf.c
index 68cabc6f..082ffc89 100644
--- a/src/caf.c
+++ b/src/caf.c
@@ -23,6 +23,7 @@
 #include	<string.h>
 #include	<ctype.h>
 #include	<math.h>
+#include	<inttypes.h>
 
 #include	"sndfile.h"
 #include	"sfendian.h"
@@ -320,7 +321,7 @@ caf_read_header (SF_PRIVATE *psf)
 					psf->peak_info->peaks [k].value = value ;
 					psf->peak_info->peaks [k].position = position ;
 
-					snprintf (psf->u.cbuf, sizeof (psf->u.cbuf), "    %2d   %-12ld   %g\n", k, (long) position, value) ;
+					snprintf (psf->u.cbuf, sizeof (psf->u.cbuf), "    %2d   %-12" PRId64 "   %g\n", k, position, value) ;
 					psf_log_printf (psf, psf->u.cbuf) ;
 					} ;