diff --git a/Source/Tests/compression.cpp b/Source/Tests/compression.cpp
index f04d8198..746a7d98 100644
--- a/Source/Tests/compression.cpp
+++ b/Source/Tests/compression.cpp
@@ -19,7 +19,7 @@ public:
 
     for (int i = 0; i < kb; i++) {
       int r = rand();
-      for (int j = 0; j < 1024/sizeof(int); j++) {
+      for (size_t j = 0; j < 1024/sizeof(int); j++) {
         buf.add(&r, sizeof(int));
       }
     }
diff --git a/Source/Tests/mmap.cpp b/Source/Tests/mmap.cpp
index ddc4bfdd..b683a340 100644
--- a/Source/Tests/mmap.cpp
+++ b/Source/Tests/mmap.cpp
@@ -44,7 +44,7 @@ public:
       char *p2 = (char *) mmap.getmore(offset2, size2);
 
       int minsize = min(size1, size2);
-      for (size_t j = 0; j < minsize; j++) {
+      for (int j = 0; j < minsize; j++) {
         CPPUNIT_ASSERT_EQUAL( p1[j], p2[j] );
       }