diff --git a/test/compilers/opencl.nix b/test/compilers/opencl.nix
index ac7bcfd9..ec0512dd 100644
--- a/test/compilers/opencl.nix
+++ b/test/compilers/opencl.nix
@@ -4,7 +4,6 @@
   opencl-headers,
   pocl,
   clinfo,
-  writableTmpDirAsHomeHook,
   runCommand,
   lib,
 }:
@@ -50,10 +49,12 @@ stdenv.mkDerivation (finalAttrs: {
               clinfo
               finalAttrs.finalPackage
               pocl
-              writableTmpDirAsHomeHook
             ];
 
-          env.POCL_DEBUG = "error,warn";
+          env = {
+            POCL_DEBUG = "error,warn";
+            POCL_CACHE_DIR = "/build/pocl_cache";
+          };
 
           requiredSystemFeatures = [ "sys-devices" ];
         }
@@ -84,10 +85,12 @@ stdenv.mkDerivation (finalAttrs: {
         {
           nativeBuildInputs = [
             finalAttrs.finalPackage
-            writableTmpDirAsHomeHook
           ];
 
-          env.POCL_DEBUG = "error,warn";
+          env = {
+            POCL_DEBUG = "error,warn";
+            POCL_CACHE_DIR = "/build/pocl_cache";
+          };
 
           requiredSystemFeatures = [ "sys-devices" ];
         }
diff --git a/test/compilers/pocl.nix b/test/compilers/pocl.nix
index eb6b979a..ff840ab0 100644
--- a/test/compilers/pocl.nix
+++ b/test/compilers/pocl.nix
@@ -2,7 +2,6 @@
   runCommand,
   pocl,
   clinfo,
-  writableTmpDirAsHomeHook,
 }:
 
 runCommand "clinfo-pocl"
@@ -10,12 +9,14 @@ runCommand "clinfo-pocl"
     nativeBuildInputs = [
       clinfo
       pocl
-      writableTmpDirAsHomeHook
     ];
 
     requiredSystemFeatures = [ "sys-devices" ];
 
-    env.POCL_DEBUG = "error,warn";
+    env = {
+      POCL_DEBUG = "error,warn";
+      POCL_CACHE_DIR = "/build/pocl_cache";
+    };
   }
   ''
     echo $OCL_ICD_VENDORS