diff --git a/platform/webSymbols/src/com/intellij/webSymbols/patterns/impl/PatternImplUtils.kt b/platform/webSymbols/src/com/intellij/webSymbols/patterns/impl/PatternImplUtils.kt
index 2411aad536cf..44e7251f9ed0 100644
--- a/platform/webSymbols/src/com/intellij/webSymbols/patterns/impl/PatternImplUtils.kt
+++ b/platform/webSymbols/src/com/intellij/webSymbols/patterns/impl/PatternImplUtils.kt
@@ -75,7 +75,7 @@ internal const val SPECIAL_MATCHED_CONTRIB = "\$special$"
 
 internal fun getPatternCompletablePrefix(pattern: String?): String {
   if (pattern == null || pattern.contains('|')) return ""
-  for (i in 0..pattern.length) {
+  for (i in 0 until pattern.length) {
     val char = pattern[i]
     if (SPECIAL_CHARS.contains(char)) {
       return pattern.substring(0 until i)
@@ -138,4 +138,4 @@ internal fun WebSymbolNameSegment.isEmpty() =
 
 internal fun MatchResult.prefixedWith(prevResult: MatchResult?): MatchResult =
   prevResult?.let { MatchResult(it.segments + this.segments) }
-  ?: this
\ No newline at end of file
+  ?: this