diff --git a/pkg/twmerge/modifier-utils.go b/pkg/twmerge/modifier-utils.go
index 315eabf..884799b 100644
--- a/pkg/twmerge/modifier-utils.go
+++ b/pkg/twmerge/modifier-utils.go
@@ -46,6 +46,11 @@ func MakeSplitModifiers(conf *TwMergeConfig) SplitModifiersFn {
 			baseClass = baseClassWithImportant
 		}
 
+		// fix case where there is modifier & maybePostfix which causes maybePostfix to be beyond size of baseClass
+		if maybePostfixModPosition != -1 && maybePostfixModPosition > modifierStart {
+			maybePostfixModPosition -= modifierStart
+		}
+
 		return baseClass, modifiers, hasImportant, maybePostfixModPosition
 
 	}