diff --git a/src/bin/jp2/opj_compress.c b/src/bin/jp2/opj_compress.c
index 2ef1c6be..dc228e27 100644
--- a/src/bin/jp2/opj_compress.c
+++ b/src/bin/jp2/opj_compress.c
@@ -1694,7 +1694,7 @@ OPJ_FLOAT64 opj_clock(void)
     /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
     /* t is the high resolution performance counter (see MSDN) */
     QueryPerformanceCounter(& t) ;
-    return freq.QuadPart ? (t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) : 0 ;
+    return freq.QuadPart ? ((OPJ_FLOAT64) t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) : 0 ;
 #else
     /* Unix or Linux: use resource usage */
     struct rusage t;
diff --git a/src/bin/jp2/opj_decompress.c b/src/bin/jp2/opj_decompress.c
index 90dbbfcc..89fd2025 100644
--- a/src/bin/jp2/opj_decompress.c
+++ b/src/bin/jp2/opj_decompress.c
@@ -935,7 +935,7 @@ OPJ_FLOAT64 opj_clock(void)
     /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
     /* t is the high resolution performance counter (see MSDN) */
     QueryPerformanceCounter(& t) ;
-    return freq.QuadPart ? (t.QuadPart / (OPJ_FLOAT64)freq.QuadPart) : 0;
+    return freq.QuadPart ? ((OPJ_FLOAT64)t.QuadPart / (OPJ_FLOAT64)freq.QuadPart) : 0;
 #elif defined(__linux)
     struct timespec ts;
     clock_gettime(CLOCK_REALTIME, &ts);
diff --git a/src/bin/jp2/windirent.h b/src/bin/jp2/windirent.h
index b7ed9a3c..19509822 100644
--- a/src/bin/jp2/windirent.h
+++ b/src/bin/jp2/windirent.h
@@ -285,7 +285,9 @@ extern "C" {
 static DIR *opendir(const char *dirname);
 static struct dirent *readdir(DIR *dirp);
 static int closedir(DIR *dirp);
+#ifdef unused
 static void rewinddir(DIR *dirp);
+#endif
 
 /*
  * Implement dirent interface as static functions so that the user does not
@@ -544,6 +546,7 @@ closedir(DIR *dirp)
 }
 
 
+#ifdef unused
 /*
  * <function name="rewinddir">
  * <intro>rewind directory stream to the beginning
@@ -593,7 +596,7 @@ rewinddir(DIR *dirp)
         /*EMPTY*/;
     }
 }
-
+#endif
 
 /*
  * Open native directory stream object and retrieve first file.
diff --git a/src/lib/openjp2/opj_clock.c b/src/lib/openjp2/opj_clock.c
index ab026ea2..24f79a9a 100644
--- a/src/lib/openjp2/opj_clock.c
+++ b/src/lib/openjp2/opj_clock.c
@@ -49,7 +49,7 @@ OPJ_FLOAT64 opj_clock(void)
     /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
     /* t is the high resolution performance counter (see MSDN) */
     QueryPerformanceCounter(& t) ;
-    return (t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) ;
+    return ((OPJ_FLOAT64) t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) ;
 #else
     /* Unix or Linux: use resource usage */
     struct rusage t;