diff --git a/src/node.c b/src/node.c
index 0b208a0..b2d339c 100644
--- a/src/node.c
+++ b/src/node.c
@@ -158,7 +158,7 @@ void r3_tree_compile_patterns(node * n) {
     char * cpat;
     char * p;
 
-    cpat = zcalloc(128);
+    cpat = zcalloc(sizeof(char) * 128);
     if (cpat==NULL)
         return;
 
@@ -190,7 +190,7 @@ void r3_tree_compile_patterns(node * n) {
     info("pattern: %s\n",cpat);
 
     n->ov_cnt = (1 + n->edge_len) * 3;
-    n->ov = (int*) zcalloc(n->ov_cnt);
+    n->ov = (int*) zcalloc(sizeof(int) * n->ov_cnt);
 
 
     n->combined_pattern = cpat;
diff --git a/tests/check_slug.c b/tests/check_slug.c
index 22fe635..8b0adcd 100644
--- a/tests/check_slug.c
+++ b/tests/check_slug.c
@@ -63,7 +63,7 @@ START_TEST (test_inside_slug)
     int slug_len = 0;
     char * pattern = "/user/{name:\\s+}/to/{id}";
     char * offset = strchr(pattern, '{') + 2;
-    ck_assert( inside_slug(pattern, strlen(pattern), offset) );
+    ck_assert( (int)inside_slug(pattern, strlen(pattern), offset) );
     ck_assert( *(inside_slug(pattern, strlen(pattern), offset)) == '{' );
     ck_assert( ! inside_slug(pattern, strlen(pattern), pattern) );
 }
diff --git a/tests/check_tree.c b/tests/check_tree.c
index 718d711..cfa28c5 100644
--- a/tests/check_tree.c
+++ b/tests/check_tree.c
@@ -72,27 +72,27 @@ START_TEST (test_compile)
 
     entry = match_entry_createl( "foo" , strlen("/foo") );
     m = r3_tree_matchl( n , "/foo", strlen("/foo"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 
     entry = match_entry_createl( "/zoo" , strlen("/zoo") );
     m = r3_tree_matchl( n , "/zoo", strlen("/zoo"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 
     entry = match_entry_createl( "/bar" , strlen("/bar") );
     m = r3_tree_matchl( n , "/bar", strlen("/bar"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 
     entry = match_entry_createl( "/xxx" , strlen("/xxx") );
     m = r3_tree_matchl( n , "/xxx", strlen("/xxx"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 
     entry = match_entry_createl( "/foo/xxx" , strlen("/foo/xxx") );
     m = r3_tree_matchl( n , "/foo/xxx", strlen("/foo/xxx"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 
     entry = match_entry_createl( "/some_id" , strlen("/some_id") );
     m = r3_tree_matchl( n , "/some_id", strlen("/some_id"), entry);
-    ck_assert( m );
+    ck_assert( (int)m );
 }
 END_TEST
 
@@ -107,7 +107,7 @@ START_TEST (test_pcre_patterns_insert)
 
     node *matched;
     matched = r3_tree_matchl(n, "/post/111-222", strlen("/post/111-222"), NULL);
-    ck_assert(matched);
+    ck_assert((int)matched);
     ck_assert(matched->endpoint > 0);
 
     // incomplete string shouldn't match
@@ -133,7 +133,7 @@ START_TEST (test_pcre_patterns_insert_2)
     r3_tree_dump(n, 0);
     node *matched;
     matched = r3_tree_match(n, "/post/11/22", NULL);
-    ck_assert(matched);
+    ck_assert((int)matched);
     ck_assert(matched->endpoint > 0);
 }
 END_TEST
@@ -160,7 +160,7 @@ START_TEST (test_pcre_patterns_insert_3)
 
 
     matched = r3_tree_match(n, "/post/11/22", NULL);
-    ck_assert(matched);
+    ck_assert((int)matched);
 
     matched = r3_tree_match(n, "/post/11", NULL);
     ck_assert(!matched);