diff --git a/src/Assembleur.cpp b/src/Assembleur.cpp
index 50bf1c5..b2637a0 100644
--- a/src/Assembleur.cpp
+++ b/src/Assembleur.cpp
@@ -106,7 +106,10 @@ std::uint32_t Assembleur::ParseIO(Instruction a_Instruction, std::uint32_t a_R1,
 static std::uint32_t ParseRegistry(const std::string& a_Str) {
 	if (a_Str.at(0) != 'R')
 		throw std::runtime_error("Registry " + a_Str + " not found !");
-	return std::stoi(a_Str.substr(1));
+	std::uint32_t registry = std::stoi(a_Str.substr(1));
+	if (registry > 7)
+		throw std::runtime_error("You can only have up to 8 registries !");
+	return registry;
 }
 
 static bool IsConstant(const std::string& a_Str) {