diff --git a/idea/src/org/jetbrains/kotlin/idea/KotlinFoldingBuilder.kt b/idea/src/org/jetbrains/kotlin/idea/KotlinFoldingBuilder.kt
index 12ecc8b0522..32231aec21a 100644
--- a/idea/src/org/jetbrains/kotlin/idea/KotlinFoldingBuilder.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/KotlinFoldingBuilder.kt
@@ -100,16 +100,20 @@ class KotlinFoldingBuilder : CustomFoldingBuilder(), DumbAware {
     override fun getLanguagePlaceholderText(node: ASTNode, range: TextRange): String = when {
         node.elementType == KtTokens.BLOCK_COMMENT -> "/${getFirstLineOfComment(node)}.../"
         node.elementType == KDocTokens.KDOC -> "/**${getFirstLineOfComment(node)}...*/"
-        node.elementType == KtNodeTypes.STRING_TEMPLATE -> "\"\"\"${getFirstLineOfString(node)}...\"\"\""
+        node.elementType == KtNodeTypes.STRING_TEMPLATE -> "\"\"\"${getTrimmedFirstLineOfString(node).addSpaceIfNeeded()}...\"\"\""
         node.psi is KtImportList -> "..."
         else ->  "{...}"
     }
 
-    private fun getFirstLineOfString(node: ASTNode): String {
-        val targetStringLine = node.text.split("\n").asSequence().map {
-            it.replace("\"\"\"", "")
-        }.firstOrNull(String::isNotBlank) ?: return ""
-        return " ${targetStringLine.replace("\"\"\"", "").trim()} "
+    private fun getTrimmedFirstLineOfString(node: ASTNode): String {
+        val lines = node.text.split("\n")
+        val firstLine = lines.asSequence().map { it.replace("\"\"\"", "").trim() }.firstOrNull(String::isNotEmpty)
+        return firstLine ?: ""
+    }
+
+    private fun String.addSpaceIfNeeded(): String {
+        if (isEmpty() || endsWith(" ")) return this
+        return this + " "
     }
 
     private fun getFirstLineOfComment(node: ASTNode): String {
diff --git a/idea/testData/folding/checkCollapse/multilineStrings.kt b/idea/testData/folding/checkCollapse/multilineStrings.kt
index 614a915b8d3..f5c3b189e30 100644
--- a/idea/testData/folding/checkCollapse/multilineStrings.kt
+++ b/idea/testData/folding/checkCollapse/multilineStrings.kt
@@ -1,4 +1,4 @@
-val result1 = <fold text='""" 14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0, 0.25, 1.0, 2.0, 1.0, 0.25, 1.0, 0.5, 2.0, 3.0, 3.0 ..."""' expand='true'>"""
+val result1 = <fold text='"""14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0, 0.25, 1.0, 2.0, 1.0, 0.25, 1.0, 0.5, 2.0, 3.0, 3.0 ..."""' expand='true'>"""
   14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0, 0.25, 1.0, 2.0, 1.0, 0.25, 1.0, 0.5, 2.0, 3.0, 3.0
   14.55576559546314  -  0.25, 4.0, 1.0, 0.5, 1.0, 1.0, 3.0, 4.0, 3.0, 0.25, 3.0, 0.5, 3.0, 3.0, 2.0
   14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0, 0.25, 2.0, 2.0, 1.0, 0.5, 1.0, 0.5, 2.0, 3.0, 3.0
@@ -22,7 +22,7 @@ val result1 = <fold text='""" 14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0,
   14.55576559546314  -  0.25, 3.0, 0.25, 0.25, 1.0, 0.25, 1.0, 2.0, 3.0, 0.3333333333333333, 1.0, 0.5, 3.0, 3.0, 2.5
 """</fold>
 
-val result2 = <fold text='""" other multiline string ..."""' expand='true'>"""other multiline string
+val result2 = <fold text='"""other multiline string ..."""' expand='true'>"""other multiline string
 without spaces
 """</fold>