diff --git a/src/nfa/limex_compile.cpp b/src/nfa/limex_compile.cpp
index 6053b56f..bbb26605 100644
--- a/src/nfa/limex_compile.cpp
+++ b/src/nfa/limex_compile.cpp
@@ -980,7 +980,7 @@ u32 addSquashMask(const build_info &args, const NFAVertex &v,
     // see if we've already seen it, otherwise add a new one.
     auto it = find(squash.begin(), squash.end(), sit->second);
     if (it != squash.end()) {
-        return verify_u32(distance(squash.begin(), it));
+        return verify_u32(std::distance(squash.begin(), it));
     }
     u32 idx = verify_u32(squash.size());
     squash.push_back(sit->second);
@@ -1007,7 +1007,7 @@ u32 addReports(const flat_set<ReportID> &r, vector<ReportID> &reports,
     auto it = search(begin(reports), end(reports), begin(my_reports),
                      end(my_reports));
     if (it != end(reports)) {
-        u32 offset = verify_u32(distance(begin(reports), it));
+        u32 offset = verify_u32(std::distance(begin(reports), it));
         DEBUG_PRINTF("reusing found report list at %u\n", offset);
         return offset;
     }