diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 08a4414..5264454 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -152,9 +152,6 @@ jobs:
             # https://github.com/status-im/nimbus-eth2/issues/3121
             export NIMFLAGS="-d:nimRawSetjmp"
           fi
-          if [[ "${{ matrix.branch }}" == "devel" ]]; then
-            export NIMFLAGS="${NIMFLAGS} -d:nimDevelFixVarParam"
-          fi
           nim --version
           nimble --version
           nimble install -y --depsOnly
diff --git a/stint/io.nim b/stint/io.nim
index 345fb3f..43c62fe 100644
--- a/stint/io.nim
+++ b/stint/io.nim
@@ -64,7 +64,7 @@ func truncate*(num: StUint, T: typedesc[SomeInteger]): T {.inline.}=
   ## Note that int and uint are 32-bit on 32-bit platform.
   ## For unsigned result type, result is modulo 2^(sizeof T in bit)
   ## For signed result type, result is undefined if input does not fit in the target type.
-  when T is SomeSignedInt:
+  when T is SomeSignedInt and sizeof(T) <= sizeof(Word):
     result = T(num.leastSignificantWord() and Word(T.high))
   else:
     result = T(num.leastSignificantWord())
diff --git a/stint/private/primitives/extended_precision_64bit_uint128.nim b/stint/private/primitives/extended_precision_64bit_uint128.nim
index a3183b0..ad8cdf1 100644
--- a/stint/private/primitives/extended_precision_64bit_uint128.nim
+++ b/stint/private/primitives/extended_precision_64bit_uint128.nim
@@ -16,11 +16,8 @@ import ../datatypes
 # ############################################################
 
 const
-  # at the time of writing June 14th 2023
-  # only devel branch codegen can generate
-  # ptr deref when using var param
-  # while version-1-6 and version-2-0 branch cannot
-  noExplicitPtrDeref = defined(cpp) or defined(nimDevelFixVarParam)
+  newerNim = (NimMajor, NimMinor) > (1, 6)
+  noExplicitPtrDeref = defined(cpp) or newerNim
 
 static:
   doAssert GCC_Compatible
diff --git a/tests/test_io.nim b/tests/test_io.nim
index 0c38ef3..63dc185 100644
--- a/tests/test_io.nim
+++ b/tests/test_io.nim
@@ -724,14 +724,14 @@ template testIO(chk, tst, handleErr: untyped) =
 
     chkDumpHexStint(chk, "abcdef0012345678abcdef1122334455", "5544332211efcdab7856341200efcdab", 128)
 
-#static:
-  #testIO(ctCheck, ctTest, ctExpect)
+static:
+  testIO(ctCheck, ctTest, ctExpect)
 
 proc main() =
   # Nim GC protests we are using too much global variables
   # so put it in a proc
   suite "Testing input and output procedures":
-    #testIO(check, test, expect)
+    testIO(check, test, expect)
 
     test "toByteArrayBE CT vs RT":
       chkCTvsRT(check, 0xab'u64, 64)