diff --git a/lib/sass/script/value/number.rb b/lib/sass/script/value/number.rb
index 9c21393..a066c5d 100644
--- a/lib/sass/script/value/number.rb
+++ b/lib/sass/script/value/number.rb
@@ -406,7 +406,13 @@ module Sass::Script::Value
     # Checks whether two numbers are within an epsilon of each other.
     # @return [Boolean]
     def self.basically_equal?(num1, num2)
-      (num1 - num2).abs < epsilon
+      if num1.is_a?(Numeric) && num2.is_a?(Numeric)
+        return (num1 - num2).abs < epsilon
+      end
+      if num1.is_a?(Numeric) || num2.is_a?(Numeric)
+        return false
+      end
+      return num1 == num2
     end
 
     # @private