diff --git a/compiler/ccgcalls.nim b/compiler/ccgcalls.nim
index 30326c8db0..b0964f97be 100644
--- a/compiler/ccgcalls.nim
+++ b/compiler/ccgcalls.nim
@@ -370,7 +370,7 @@ proc expressionsNeedsTmp(p: BProc, a: TLoc): TLoc =
 proc genArgStringToCString(p: BProc, n: PNode; result: var Builder; needsTmp: bool) {.inline.} =
   var a = initLocExpr(p, n[0])
   let tmp = withTmpIfNeeded(p, a, needsTmp)
-  let ra = if p.config.isDefined("nimsso"): addrLoc(p.config, tmp) else: tmp.rdLoc
+  let ra = if p.config.isDefined("nimsso"): byRefLoc(p, tmp) else: tmp.rdLoc
   result.addCall(cgsymValue(p.module, "nimToCStringConv"), ra)
 
 proc genArg(p: BProc, n: PNode, param: PSym; call: PNode; result: var Builder; needsTmp = false) =
diff --git a/compiler/ccgexprs.nim b/compiler/ccgexprs.nim
index b517fbd219..941327341e 100644
--- a/compiler/ccgexprs.nim
+++ b/compiler/ccgexprs.nim
@@ -2736,7 +2736,7 @@ proc genConv(p: BProc, e: PNode, d: var TLoc) =
 
 proc convStrToCStr(p: BProc, n: PNode, d: var TLoc) =
   var a: TLoc = initLocExpr(p, n[0])
-  let arg = if p.config.isDefined("nimsso"): addrLoc(p.config, a) else: rdLoc(a)
+  let arg = if p.config.isDefined("nimsso"): byRefLoc(p, a) else: rdLoc(a)
   putIntoDest(p, d, n,
     cgCall(p, "nimToCStringConv", arg),
     a.storage)
diff --git a/tests/system/tnimsso.nim b/tests/system/tnimsso.nim
new file mode 100644
index 0000000000..ca9d64faec
--- /dev/null
+++ b/tests/system/tnimsso.nim
@@ -0,0 +1,7 @@
+discard """
+  matrix: "-d:nimsso"
+  targets: "c cpp"
+"""
+
+var s = "abc"
+discard s.cstring
\ No newline at end of file