diff --git a/run-tests.py b/run-tests.py
index 712ba5e6..7ad35dfd 100644
--- a/run-tests.py
+++ b/run-tests.py
@@ -69,7 +69,6 @@ def cleanup(out):
          # todo, high priority
          'c99-6_10_3_4_p5.c',
          'c99-6_10_3_4_p6.c',
-         'cxx_compl.cpp',  # if A compl B
          'cxx_oper_keyword_ms_compat.cpp',
          'expr_usual_conversions.c', # condition is true: 4U - 30 >= 0
          'stdint.c',
diff --git a/simplecpp.cpp b/simplecpp.cpp
index e290421a..be3bf59b 100644
--- a/simplecpp.cpp
+++ b/simplecpp.cpp
@@ -699,6 +699,7 @@ void simplecpp::TokenList::combineOperators()
     }
 }
 
+static const std::string COMPL("compl");
 static const std::string NOT("not");
 void simplecpp::TokenList::constFoldUnaryNotPosNeg(simplecpp::Token *tok)
 {
@@ -706,10 +707,16 @@ void simplecpp::TokenList::constFoldUnaryNotPosNeg(simplecpp::Token *tok)
         // "not" might be !
         if (isAlternativeUnaryOp(tok, NOT))
             tok->op = '!';
+        // "compl" might be ~
+        else if (isAlternativeUnaryOp(tok, COMPL))
+            tok->op = '~';
 
         if (tok->op == '!' && tok->next && tok->next->number) {
             tok->setstr(tok->next->str == "0" ? "1" : "0");
             deleteToken(tok->next);
+        } else if (tok->op == '~' && tok->next && tok->next->number) {
+           tok->setstr(toString(~stringToLL(tok->next->str)));
+           deleteToken(tok->next);
         } else {
             if (tok->previous && (tok->previous->number || tok->previous->name))
                 continue;
@@ -1929,15 +1936,15 @@ static void simplifySizeof(simplecpp::TokenList &expr, const std::map<std::strin
     }
 }
 
-static const char * const altopData[] = {"and","or","bitand","bitor","not","not_eq","xor"};
-static const std::set<std::string> altop(&altopData[0], &altopData[7]);
+static const char * const altopData[] = {"and","or","bitand","bitor","compl","not","not_eq","xor"};
+static const std::set<std::string> altop(&altopData[0], &altopData[8]);
 static void simplifyName(simplecpp::TokenList &expr)
 {
     for (simplecpp::Token *tok = expr.front(); tok; tok = tok->next) {
         if (tok->name) {
             if (altop.find(tok->str) != altop.end()) {
                 bool alt;
-                if (tok->str == "not") {
+                if (tok->str == "not" || tok->str == "compl") {
                     alt = isAlternativeUnaryOp(tok,tok->str);
                 } else {
                     alt = isAlternativeBinaryOp(tok,tok->str);