diff --git a/tests/decodecorpus.c b/tests/decodecorpus.c
index 42360d2c4..08c2cc0a5 100644
--- a/tests/decodecorpus.c
+++ b/tests/decodecorpus.c
@@ -1490,9 +1490,12 @@ static int generateCorpusWithDict(U32 seed, unsigned numFiles, const char* const
                 /* print differences if any */
                 {
                     size_t checkDiff = (BYTE*)fr.src - (BYTE*)fr.srcStart;
-                    for (size_t i = 0; i < checkDiff; i++) {
-                        if (*((BYTE*)(fr.srcStart + i)) != *((BYTE*)(decompressedPtr + i))) {
-                            DISPLAY("i: %zu, fr: %u, decomp: %u\n", i, *((BYTE*)(fr.srcStart + i)), *((BYTE*)(decompressedPtr + i)));
+                    {
+                        size_t i;
+                        for (i = 0; i < checkDiff; i++) {
+                            if (*((BYTE*)(fr.srcStart + i)) != *((BYTE*)(decompressedPtr + i))) {
+                                DISPLAY("i: %zu, fr: %u, decomp: %u\n", i, *((BYTE*)(fr.srcStart + i)), *((BYTE*)(decompressedPtr + i)));
+                            }
                         }
                     }
                 }