diff --git a/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt b/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
index 5bb01b1a..9df0d67a 100644
--- a/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
+++ b/app/src/main/java/com/sadellie/unitto/screens/main/MainViewModel.kt
@@ -321,7 +321,7 @@ class MainViewModel @Inject constructor(
                      * "50+". We don't add "/' here. User will click "/" second time and the input
                      * will be "50/".
                      */
-                    (lastSecondSymbol in OPERATORS) -> {
+                    (lastSecondSymbol in OPERATORS) and (lastSymbol == KEY_MINUS)-> {
                         deleteDigit()
                     }
                     // Don't allow multiple operators near each other