diff --git a/src/zopfli/deflate.c b/src/zopfli/deflate.c
index abe73602..f1955f0e 100644
--- a/src/zopfli/deflate.c
+++ b/src/zopfli/deflate.c
@@ -926,6 +926,7 @@ void ZopfliDeflate(const ZopfliOptions* options, int btype, int final,
     fprintf(stderr,
             "Original Size: %lu, Deflate: %lu, Compression: %f%% Removed\n",
             (unsigned long)insize, (unsigned long)(*outsize - offset),
-            100.0 * (double)(insize - (*outsize - offset)) / (double)insize);
+            100.0 * (double)(ssize_t)(insize - (*outsize - offset))
+              / (double)insize);
   }
 }
diff --git a/src/zopfli/gzip_container.c b/src/zopfli/gzip_container.c
index 7615db30..87da6a2d 100644
--- a/src/zopfli/gzip_container.c
+++ b/src/zopfli/gzip_container.c
@@ -119,6 +119,6 @@ void ZopfliGzipCompress(const ZopfliOptions* options,
     fprintf(stderr,
             "Original Size: %d, Gzip: %d, Compression: %f%% Removed\n",
             (int)insize, (int)*outsize,
-            100.0 * (double)(insize - *outsize) / (double)insize);
+            100.0 * (double)(ssize_t)(insize - *outsize) / (double)insize);
   }
 }
diff --git a/src/zopfli/zlib_container.c b/src/zopfli/zlib_container.c
index 130ffc79..afe182c5 100644
--- a/src/zopfli/zlib_container.c
+++ b/src/zopfli/zlib_container.c
@@ -74,6 +74,6 @@ void ZopfliZlibCompress(const ZopfliOptions* options,
     fprintf(stderr,
             "Original Size: %d, Zlib: %d, Compression: %f%% Removed\n",
             (int)insize, (int)*outsize,
-            100.0 * (double)(insize - *outsize) / (double)insize);
+            100.0 * (double)(ssize_t)(insize - *outsize) / (double)insize);
   }
 }