diff --git a/valve/addons/amxmodx/scripting/agmodx.sma b/valve/addons/amxmodx/scripting/agmodx.sma
index af5db51..33596d0 100644
--- a/valve/addons/amxmodx/scripting/agmodx.sma
+++ b/valve/addons/amxmodx/scripting/agmodx.sma
@@ -1837,7 +1837,7 @@ public OnVoteMaxSpeed(id, check, argc, arg1[], arg2[]) {
 			return false;
 		}
 
-		if (!is_str_num(arg2)) {
+		if (!is_str_num_ex(arg2)) {
 			console_print(id, "%l", "INVALID_NUMBER");
 			return false;
 		}
@@ -1899,7 +1899,7 @@ public OnVoteTimeLimit(id, check, argc, arg1[], arg2[]) {
 			return false;
 		}
 
-		if (!is_str_num(arg2)) {
+		if (!is_str_num_ex(arg2)) {
 			console_print(id, "%l", "INVALID_NUMBER");
 			return false;
 		}
@@ -2046,7 +2046,7 @@ public OnVoteFragLimit(id, check, argc, arg1[], arg2[]) {
 			return false;
 		}
 
-		if (!is_str_num(arg2)) {
+		if (!is_str_num_ex(arg2)) {
 			console_print(id, "%l", "INVALID_NUMBER");
 			return false;
 		}
@@ -2087,7 +2087,7 @@ public OnVoteSelfGauss(id, check, argc, arg1[], arg2[]) {
 			return false;
 		}
 
-		if (!is_str_num(arg2)) {
+		if (!is_str_num_ex(arg2)) {
 			console_print(id, "%l", "INVALID_NUMBER");
 			return false;
 		}
diff --git a/valve/addons/amxmodx/scripting/include/agmodx_stocks.inc b/valve/addons/amxmodx/scripting/include/agmodx_stocks.inc
index 9d14b3f..1fdbd7c 100644
--- a/valve/addons/amxmodx/scripting/include/agmodx_stocks.inc
+++ b/valve/addons/amxmodx/scripting/include/agmodx_stocks.inc
@@ -290,3 +290,20 @@ stock get_skill_cvar_num(const name[]) {
 	get_skill_cvar_string(name, value, charsmax(value));
 	return str_to_num(value);
 }
+
+// Alternative to is_str_num which supports both positive and negative numbers.
+stock bool:is_str_num_ex(const sString[]) {
+	new i = 0;
+	new bool:is_negative = false;
+
+    if (sString[0] == '-') {
+        is_negative = true;
+        i++;
+    }
+
+    while (sString[i] && isdigit(sString[i])) {
+        i++;
+    }
+
+    return sString[i] == 0 && i != (is_negative ? 1 : 0);
+}