diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 65d36ca0e..af751a496 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -781,7 +781,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
         Hash h = newHashAllowEmpty(*outputHash, ht);
 
         auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName);
-        if (!jsonObject) drv.env["out"] = state.store->printStorePath(outPath);
+        drv.env["out"] = state.store->printStorePath(outPath);
         drv.outputs.insert_or_assign("out", DerivationOutput {
                 .output = DerivationOutputCAFixed {
                     .hash = FixedOutputHash {
@@ -795,7 +795,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
     else if (contentAddressed) {
         HashType ht = parseHashType(outputHashAlgo);
         for (auto & i : outputs) {
-            if (!jsonObject) drv.env[i] = hashPlaceholder(i);
+            drv.env[i] = hashPlaceholder(i);
             drv.outputs.insert_or_assign(i, DerivationOutput {
                 .output = DerivationOutputCAFloating {
                     .method = ingestionMethod,
@@ -813,7 +813,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
            that changes in the set of output names do get reflected in
            the hash. */
         for (auto & i : outputs) {
-            if (!jsonObject) drv.env[i] = "";
+            drv.env[i] = "";
             drv.outputs.insert_or_assign(i,
                 DerivationOutput {
                     .output = DerivationOutputInputAddressed {
@@ -828,7 +828,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
         for (auto & i : outputs) {
             auto outPath = state.store->makeOutputPath(i, h, drvName);
-            if (!jsonObject) drv.env[i] = state.store->printStorePath(outPath);
+            drv.env[i] = state.store->printStorePath(outPath);
             drv.outputs.insert_or_assign(i,
                 DerivationOutput {
                     .output = DerivationOutputInputAddressed {