diff --git a/include/vlog/concepts.h b/include/vlog/concepts.h
index 47852511..7cf79dc2 100644
--- a/include/vlog/concepts.h
+++ b/include/vlog/concepts.h
@@ -398,7 +398,7 @@ class Rule {
             return heads[0];
         }
 
-        Literal getHead(uint8_t pos) const {
+        Literal getHead(unsigned pos) const {
             return heads[pos];
         }
 
@@ -416,8 +416,8 @@ class Rule {
             return body;
         }
 
-        uint8_t getNIDBPredicates() const {
-            uint8_t i = 0;
+        unsigned getNIDBPredicates() const {
+            unsigned i = 0;
             for (std::vector<Literal>::const_iterator itr = body.begin(); itr != body.end();
                     ++itr) {
                 if (itr->getPredicate().getType() == IDB) {
@@ -427,8 +427,8 @@ class Rule {
             return i;
         }
 
-        uint8_t getNIDBNotMagicPredicates() const {
-            uint8_t i = 0;
+        unsigned getNIDBNotMagicPredicates() const {
+            unsigned i = 0;
             for (std::vector<Literal>::const_iterator itr = body.begin(); itr != body.end();
                     ++itr) {
                 if (itr->getPredicate().getType() == IDB && !itr->getPredicate().isMagic()) {
@@ -438,8 +438,8 @@ class Rule {
             return i;
         }
 
-        uint8_t getNEDBPredicates() const {
-            uint8_t i = 0;
+        unsigned getNEDBPredicates() const {
+            unsigned i = 0;
             for (std::vector<Literal>::const_iterator itr = body.begin(); itr != body.end();
                     ++itr) {
                 if (itr->getPredicate().getType() == EDB) {
@@ -449,8 +449,8 @@ class Rule {
             return i;
         }
 
-        uint8_t numberOfNegatedLiteralsInBody() {
-            uint8_t result = 0;
+        unsigned numberOfNegatedLiteralsInBody() {
+            unsigned result = 0;
             for (std::vector<Literal>::const_iterator itr = getBody().begin();
                     itr != getBody().end(); ++itr) {
                 if (itr->isNegated()){
diff --git a/include/vlog/fctable.h b/include/vlog/fctable.h
index ac6e225c..ff35caeb 100644
--- a/include/vlog/fctable.h
+++ b/include/vlog/fctable.h
@@ -25,15 +25,15 @@ struct FCBlock {
     std::shared_ptr<const FCInternalTable> table;
 
     Literal query;
-    uint8_t posQueryInRule;
     const RuleExecutionDetails *rule;
-    const uint8_t ruleExecOrder;
+    unsigned posQueryInRule;
+    const unsigned ruleExecOrder;
 
     bool isCompleted;
 
     FCBlock(size_t iteration, std::shared_ptr<const FCInternalTable> table,
-            Literal query, uint8_t posQueryInRule, const RuleExecutionDetails *rule,
-            const uint8_t ruleExecOrder, bool isCompleted) : iteration(iteration),
+            Literal query, unsigned posQueryInRule, const RuleExecutionDetails *rule,
+            const unsigned ruleExecOrder, bool isCompleted) : iteration(iteration),
     table(table), query(query), posQueryInRule(posQueryInRule),
     rule(rule), ruleExecOrder(ruleExecOrder),
     isCompleted(isCompleted) {
@@ -153,8 +153,8 @@ class FCTable {
         void addBlock(FCBlock block);
 
         bool add(std::shared_ptr<const FCInternalTable> t, const Literal &literal,
-                const uint8_t posLiteralInRule, const RuleExecutionDetails *detailsRule,
-                const uint8_t ruleExecOrder,
+                const unsigned posLiteralInRule, const RuleExecutionDetails *detailsRule,
+                const unsigned ruleExecOrder,
                 const size_t iteration, const bool isCompleted, int nthreads);
 
         int nBlocks() {
diff --git a/src/vlog/forward/fctable.cpp b/src/vlog/forward/fctable.cpp
index 79e32686..921a53a9 100644
--- a/src/vlog/forward/fctable.cpp
+++ b/src/vlog/forward/fctable.cpp
@@ -220,7 +220,7 @@ std::shared_ptr<const FCTable> FCTable::filter(const Literal &literal,
         uint8_t nVarsToCopy = 0;
         uint8_t posVarsToCopy[256];
 
-        for (int i = 0; i < (uint8_t) literal.getTupleSize(); ++i) {
+        for (int i = 0; i < literal.getTupleSize(); ++i) {
             VTerm t = literal.getTermAtPos(i);
             if (!t.isVariable()) {
                 posConstantsToFilter[nConstantsToFilter] = i;
@@ -363,9 +363,9 @@ std::shared_ptr<const Segment> FCTable::retainFrom(
 
 bool FCTable::add(std::shared_ptr<const FCInternalTable> t,
         const Literal &literal,
-        const uint8_t posLiteralInRule,
+        const unsigned posLiteralInRule,
         const RuleExecutionDetails *rule,
-        const uint8_t ruleExecOrder,
+        const unsigned ruleExecOrder,
         const size_t iteration, const bool isCompleted,
         int nthreads) {
     assert(t->getRowSize() == this->getSizeRow());