1 files changed, 6 insertions, 6 deletions

diff --git a/src/Persistent_cohomology/include/gudhi/Persistent_cohomology/Field_Zp.h b/src/Persistent_cohomology/include/gudhi/Persistent_cohomology/Field_Zp.h
index 419bd2eb..5d0c9f9f 100644
--- a/src/Persistent_cohomology/include/gudhi/Persistent_cohomology/Field_Zp.h
+++ b/src/Persistent_cohomology/include/gudhi/Persistent_cohomology/Field_Zp.h
@@ -46,8 +46,8 @@ class Field_Zp {
         add_id_all(0) {
   }
 
-  void init(uint16_t charac) {
-    assert(charac != 0);  // division by zero
+  void init(int charac) {
+    assert(charac > 0);  // division by zero + non negative values
     Prime = charac;
     inverse_.clear();
     inverse_.reserve(charac);
@@ -62,7 +62,7 @@ class Field_Zp {
 
   /** Set x <- x + w * y*/
   Element plus_times_equal(const Element& x, const Element& y, const Element& w) {
-    assert(Prime != 0);  // division by zero
+    assert(Prime > 0);  // division by zero + non negative values
     Element result = (x + w * y) % Prime;
     if (result < 0)
       result += Prime;
@@ -98,18 +98,18 @@ class Field_Zp {
 
   /** Returns -x * y.*/
   Element times_minus(Element x, Element y) {
-    assert(Prime != 0);  // division by zero
+    assert(Prime > 0);  // division by zero + non negative values
     Element out = (-x * y) % Prime;
     return (out < 0) ? out + Prime : out;
   }
 
   /** \brief Returns the characteristic \f$p\f$ of the field.*/
-  const uint16_t& characteristic() const {
+  const int& characteristic() const {
     return Prime;
   }
 
  private:
-  uint16_t Prime;
+  int Prime;
   /** Property map Element -> Element, which associate to an element its inverse in the field.*/
   std::vector<Element> inverse_;
   const Element mult_id_all;