error: use of overloaded operator '=' is ambiguous (with operand types 'KN<idx_t>' (aka 'KN<long>') and 'int') about freefem-sources HOT 3 CLOSED

diff --git a/plugin/seq/metis.cpp b/plugin/seq/metis.cpp
index da7bcb6b..c4b1b580 100644
--- a/plugin/seq/metis.cpp
+++ b/plugin/seq/metis.cpp
@@ -99,3 +99,3 @@ KN< R > *partmetis( KN< R > *const &part, FESPACE *const &pVh, long const &lpart
 #endif
-  } else epart = 0;
+  } else epart = static_cast<idx_t>(0);
   part->resize(nv);
@@ -156,3 +156,3 @@ KN< R > *partmetis(Stack s, KN< R > *const &part, Mesh *const &pTh, long const &
 #endif
-  } else epart = 0;
+  } else epart = static_cast<idx_t>(0);
   part->resize(nt);
@@ -186,3 +186,3 @@ KN< long > *partmetisd(Stack s, KN< long > *const &part, Mesh *const &pTh, long
 #endif
-  } else epart = 0;
+  } else epart = static_cast<idx_t>(0);
   part->resize(nt);