diff --git a/koch.nim b/koch.nim
index 7059e87a587c9..8ce61a21a9cf9 100644
--- a/koch.nim
+++ b/koch.nim
@@ -286,11 +286,13 @@ proc boot(args: string) =
   copyExe(findStartNim(), 0.thVersion)
   for i in 0..2:
     echo "iteration: ", i+1
-    let extraOption = if i == 0:
-      "--skipUserCfg"
+    var extraOption = ""
+    if i == 0:
+      extraOption.add " --skipUserCfg"
         # forward compatibility: for bootstrap (1st iteration), avoid user flags
         # that could break things, see #10030
-    else: ""
+      extraOption.add " -d:nimBoostrapCsources0_19_0"
+        # remove this when csources get updated
     exec i.thVersion & " $# $# $# --nimcache:$# compiler" / "nim.nim" %
       [bootOptions, extraOption, args, smartNimcache]
     if sameFileContent(output, i.thVersion):
diff --git a/lib/system.nim b/lib/system.nim
index fb52ee9eb2132..28fb37e4dcf85 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -569,7 +569,12 @@ type
       trace: string
     else:
       trace: seq[StackTraceEntry]
-    raiseId: uint # set when exception is raised
+    when defined(nimBoostrapCsources0_19_0):
+      # see #10315, bootstrap with `nim cpp` from csources gave error:
+      # error: no member named 'raise_id' in 'Exception'
+      raiseId: uint # set when exception is raised
+    else:
+      raiseId: uint # set when exception is raised
     up: ref Exception # used for stacking exceptions. Not exported!
 
   Defect* = object of Exception ## \