diff --git a/include/Nazara/Shader/ShaderLangTokenList.hpp b/include/Nazara/Shader/ShaderLangTokenList.hpp
index 8943f7e1f..05d60d111 100644
--- a/include/Nazara/Shader/ShaderLangTokenList.hpp
+++ b/include/Nazara/Shader/ShaderLangTokenList.hpp
@@ -42,6 +42,7 @@ NAZARA_SHADERLANG_TOKEN(LogicalAnd)
 NAZARA_SHADERLANG_TOKEN(LogicalOr)
 NAZARA_SHADERLANG_TOKEN(Multiply)
 NAZARA_SHADERLANG_TOKEN(Minus)
+NAZARA_SHADERLANG_TOKEN(Not)
 NAZARA_SHADERLANG_TOKEN(NotEqual)
 NAZARA_SHADERLANG_TOKEN(Plus)
 NAZARA_SHADERLANG_TOKEN(OpenCurlyBracket)
diff --git a/src/Nazara/Shader/ShaderLangLexer.cpp b/src/Nazara/Shader/ShaderLangLexer.cpp
index 07b5b6989..875a0e946 100644
--- a/src/Nazara/Shader/ShaderLangLexer.cpp
+++ b/src/Nazara/Shader/ShaderLangLexer.cpp
@@ -303,6 +303,21 @@ namespace Nz::ShaderLang
 					break;
 				}
 
+				case '!':
+				{
+					char next = Peek();
+					if (next == '=')
+					{
+						currentPos++;
+						tokenType = TokenType::NotEqual;
+					}
+					else
+						tokenType = TokenType::Not;
+
+					break;
+				}
+
+
 				case '+': tokenType = TokenType::Plus; break;
 				case '*': tokenType = TokenType::Multiply; break;
 				case ':': tokenType = TokenType::Colon; break;
diff --git a/src/Nazara/Shader/ShaderLangParser.cpp b/src/Nazara/Shader/ShaderLangParser.cpp
index 327153b22..3d7fc4a74 100644
--- a/src/Nazara/Shader/ShaderLangParser.cpp
+++ b/src/Nazara/Shader/ShaderLangParser.cpp
@@ -1117,6 +1117,14 @@ namespace Nz::ShaderLang
 				return ShaderBuilder::Unary(ShaderAst::UnaryType::Plus, std::move(expr));
 			}
 
+			case TokenType::Not:
+			{
+				Consume();
+				ShaderAst::ExpressionPtr expr = ParsePrimaryExpression();
+
+				return ShaderBuilder::Unary(ShaderAst::UnaryType::LogicalNot, std::move(expr));
+			}
+
 			case TokenType::OpenParenthesis:
 				return ParseParenthesisExpression();