diff --git a/src/main/java/com/anatawa12/fixRtm/Utils.kt b/src/main/java/com/anatawa12/fixRtm/Utils.kt
index 76caac08..63eee2b1 100644
--- a/src/main/java/com/anatawa12/fixRtm/Utils.kt
+++ b/src/main/java/com/anatawa12/fixRtm/Utils.kt
@@ -174,3 +174,55 @@ fun <T> T.addEntityCrashInfoAboutModelSet(
 }
 
 fun arrayOfItemStack(size: Int) = Array(size) { ItemStack.EMPTY }
+
+private const val START = 0
+private const val KEY = 1
+private const val STR_BS = 2
+private const val STR_BS_U0 = 3 // \u|0000
+private const val STR_BS_U1 = 4 // \u0|000
+private const val STR_BS_U2 = 5 // \u00|00
+private const val STR_BS_U3 = 6 // \u000|0
+private const val STR = 7
+
+fun joinLinesForJsonReading(lines: List<String>): String = buildString {
+    var stat = START
+    var shouldAddNewLine = false
+    for (line in lines) {
+        for (c in line) {
+            val preStat = stat
+            when (stat) {
+                START -> {
+                    if (c in '0'..'9' || c in 'a'..'z' || c in 'A'..'Z' || c == '+' || c == '-' || c == '.')
+                        stat = KEY
+                    else if (c == '"')
+                        stat = STR
+                }
+                KEY -> {
+                    if (c in '0'..'9' || c in 'a'..'z' || c in 'A'..'Z' || c == '+' || c == '-' || c == '.')
+                        stat = KEY
+                    else
+                        stat = START
+                }
+                STR -> {
+                    when (c) {
+                        '\\' -> stat = STR_BS
+                        '"' -> stat = START
+                    }
+                }
+                STR_BS -> {
+                    when (c) {
+                        'u' -> stat = STR_BS_U0
+                        else -> stat = STR
+                    }
+                }
+                STR_BS_U0, STR_BS_U1, STR_BS_U2, STR_BS_U3 -> {
+                    stat++
+                }
+            }
+            if (shouldAddNewLine && (preStat == START || stat == START)) append('\n')
+            shouldAddNewLine = false
+            append(c)
+        }
+        shouldAddNewLine = true
+    }
+}
diff --git a/src/main/rtm-patches/jp/ngt/rtm/modelpack/ModelPackManager.java.pm.patch b/src/main/rtm-patches/jp/ngt/rtm/modelpack/ModelPackManager.java.pm.patch
index ac1268cf..ed4f5253 100644
--- a/src/main/rtm-patches/jp/ngt/rtm/modelpack/ModelPackManager.java.pm.patch
+++ b/src/main/rtm-patches/jp/ngt/rtm/modelpack/ModelPackManager.java.pm.patch
@@ -87,7 +87,7 @@
 +            "file and file is exists.", file.getAbsolutePath());
  
 -      throw new ModelPackException("Can't load model", file.getAbsolutePath());
-+      ResourceConfig resourceconfig = (ResourceConfig)NGTJson.getObjectFromJson(NGTText.append(json, true), type.cfgClass);
++      ResourceConfig resourceconfig = (ResourceConfig)NGTJson.getObjectFromJson(com.anatawa12.fixRtm.UtilsKt.joinLinesForJsonReading(json), type.cfgClass);
 +      resourceconfig.file = file;
 +      return this.registerResourceSet(type, resourceconfig, NGTText.append(json, false));
     }
diff --git a/src/test/java/com/anatawa12/fixRtm/UtilsKtTest.kt b/src/test/java/com/anatawa12/fixRtm/UtilsKtTest.kt
new file mode 100644
index 00000000..c5af27b3
--- /dev/null
+++ b/src/test/java/com/anatawa12/fixRtm/UtilsKtTest.kt
@@ -0,0 +1,71 @@
+package com.anatawa12.fixRtm
+
+import net.minecraftforge.common.ForgeVersion
+import net.minecraftforge.fml.common.Loader
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.io.File
+
+internal class UtilsKtTest {
+    companion object {
+        init {
+            Loader.injectData(
+                ForgeVersion.majorVersion.toString(), // major
+                ForgeVersion.minorVersion.toString(), // minor
+                ForgeVersion.revisionVersion.toString(), // rev
+                ForgeVersion.buildVersion.toString(), // build
+                ForgeVersion.mcVersion, // mccversion
+                ForgeVersion.mcpVersion, // mcpversion
+                File("eclipse"), // minecraftDir
+                mutableListOf<Nothing>(), // injectedContainers
+            )
+            Loader::class.java.getDeclaredMethod("initializeLoader").also { it.isAccessible = true }
+                .invoke(Loader.instance())
+        }
+    }
+
+    @Test
+    fun joinLinesForJsonReading() {
+        val validJson = """
+            {
+                "integer": 10,
+                "number": 0.0,
+                "number-expo": 0.0e+0,
+                "signed-number": -0.0e+0,
+                "string": "some string",
+                "escaped": "\"\r\n",
+                "end": 0
+            }
+        """.trimIndent()
+        val validJsonTokens = """
+            "integer": 0,
+            "number": 0.0,
+            "number-expo": 0.0e+0,
+            "signed-number": -0.0e+0,
+            "string": "some string",
+            "escaped": "\"\r\n",
+            "end": 0,
+        """.trimIndent()
+        val invalidJson = """
+            {
+                "integer": 1
+            0,
+                "number": 0.
+            0,
+                "number-expo": 0.0
+            e+0,
+                "signed-number": -
+            0.0e+0,
+                "string": "some
+             string",
+                "escaped": "\
+            "\r\n",
+                "end": 0
+            }
+        """.trimIndent()
+
+        assertEquals(validJson, joinLinesForJsonReading(validJson.lines()))
+        assertEquals(validJsonTokens, joinLinesForJsonReading(validJsonTokens.lines()))
+        assertEquals(validJson, joinLinesForJsonReading(invalidJson.lines()))
+    }
+}