diff --git a/src/eval.cpp b/src/eval.cpp
index 7df3953425..89927b8f4b 100644
--- a/src/eval.cpp
+++ b/src/eval.cpp
@@ -759,7 +759,13 @@ namespace Sass {
       if (operand->concrete_type() == Expression::NULL_VAL && dynamic_cast<Variable*>(u->operand())) {
         u->operand(SASS_MEMORY_NEW(ctx.mem, String_Quoted, u->pstate(), ""));
       }
-      else u->operand(operand);
+      // Never apply unary opertions on colors @see #2140
+      else if (operand->concrete_type() == Expression::COLOR) {
+        operand = u->operand();
+      }
+      else {
+        u->operand(operand);
+      }
       String_Constant* result = SASS_MEMORY_NEW(ctx.mem, String_Quoted,
                                                   u->pstate(),
                                                   u->inspect());