diff --git a/pkgs/by-name/am/ameba/package.nix b/pkgs/by-name/am/ameba/package.nix
index c1ce7a669fad..429e0ef8a062 100644
--- a/pkgs/by-name/am/ameba/package.nix
+++ b/pkgs/by-name/am/ameba/package.nix
@@ -1,10 +1,12 @@
 {
   lib,
   fetchFromGitHub,
-  crystal,
+  crystal_1_17,
   coreutils,
 }:
-
+let
+  crystal = crystal_1_17;
+in
 crystal.buildCrystalPackage rec {
   pname = "ameba";
   version = "1.6.4";
diff --git a/pkgs/by-name/bl/blahaj/package.nix b/pkgs/by-name/bl/blahaj/package.nix
index 258da854cfb8..b834d213e8fe 100644
--- a/pkgs/by-name/bl/blahaj/package.nix
+++ b/pkgs/by-name/bl/blahaj/package.nix
@@ -1,13 +1,16 @@
 {
   lib,
   stdenv,
-  crystal,
+  crystal_1_17,
   fetchFromGitHub,
   # https://crystal-lang.org/2019/09/06/parallelism-in-crystal/
   multithreading ? true,
   static ? stdenv.hostPlatform.isStatic,
 }:
 
+let
+  crystal = crystal_1_17;
+in
 crystal.buildCrystalPackage rec {
   pname = "blahaj";
   version = "2.2.0";