diff --git a/src/globals.h b/src/globals.h
index bca5aef8..92167c06 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -88,10 +88,10 @@ EXTERN  INIT(   int     DeltaOverride, 0);
 EXTERN  INIT(   int     RunDisabled, 0);
 EXTERN  INIT(   int     ExpressionEvaluationDisabled, 0);
 EXTERN  INIT(   int     ExpressionEvaluationTimeLimit, 0);
-EXTERN  INIT(   int     ExpressionNodesEvaluated, 0);
-EXTERN  INIT(   int     MaxExprNodesPerLine, 0);
-EXTERN  INIT(   int     ExpressionNodesEvaluatedThisLine, 0);
-EXTERN  INIT(   int     ExpressionNodeLimitPerLine, 10000000);
+EXTERN  INIT(   unsigned long  ExpressionNodesEvaluated, 0);
+EXTERN  INIT(   unsigned long  MaxExprNodesPerLine, 0);
+EXTERN  INIT(   unsigned long  ExpressionNodesEvaluatedThisLine, 0);
+EXTERN  INIT(   unsigned long  ExpressionNodeLimitPerLine, 10000000);
 EXTERN  INIT(   volatile sig_atomic_t ExpressionTimeLimitExceeded, 0);
 EXTERN  INIT(   int     IgnoreOnce, 0);
 EXTERN  INIT(   char const *OnceFile, NULL);
diff --git a/src/init.c b/src/init.c
index de380d3e..5e268ecf 100644
--- a/src/init.c
+++ b/src/init.c
@@ -1154,6 +1154,8 @@ static void
 ProcessLongOption(char const *arg)
 {
     int t;
+    unsigned long tt;
+
     if (!strcmp(arg, "test")) {
         fprintf(stderr, "Enabling test mode: This is meant for the acceptance test.\nDo not use --test in production.\nIn test mode, the system time is fixed at 2025-01-06@19:00\n");
         TestMode = 1;
@@ -1222,12 +1224,8 @@ ProcessLongOption(char const *arg)
         print_sysvar_tokens();
         exit(0);
     }
-    if (sscanf(arg, "max-expr-complexity=%d", &t) == 1) {
-        if (t < 0) {
-            fprintf(ErrFp, "%s: --max-expr-complexity must be non-negative\n", ArgV[0]);
-            return;
-        }
-        ExpressionNodeLimitPerLine = t;
+    if (sscanf(arg, "max-expr-complexity=%lu", &tt) == 1) {
+        ExpressionNodeLimitPerLine = tt;
         return;
     }
     if (sscanf(arg, "max-execution-time=%d", &t) == 1) {
diff --git a/src/main.c b/src/main.c
index 20fd6124..e0a2ac8b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -84,8 +84,8 @@ exitfunc(void)
 
         UnsetAllUserFuncs();
         print_expr_nodes_stats();
-        fprintf(ErrFp, "Max expr node evaluations per line: %d\n", MaxExprNodesPerLine);
-        fprintf(ErrFp, "Total expression node evaluations:  %d\n", ExpressionNodesEvaluated);
+        fprintf(ErrFp, "Max expr node evaluations per line: %lu\n", MaxExprNodesPerLine);
+        fprintf(ErrFp, "Total expression node evaluations:  %lu\n", ExpressionNodesEvaluated);
     }
 }