diff --git a/nix/packages/anyrun.nix b/nix/packages/anyrun.nix
index 8d49958..340db05 100644
--- a/nix/packages/anyrun.nix
+++ b/nix/packages/anyrun.nix
@@ -70,7 +70,7 @@ in
       then pname
       else null;
 
-    CARGO_BUILD_INCREMENTAL = 0;
+    CARGO_BUILD_INCREMENTAL = "false";
     RUST_BACKTRACE = "full";
 
     postInstall = ''
diff --git a/nix/packages/plugin.nix b/nix/packages/plugin.nix
index 1033a6a..3e4594a 100644
--- a/nix/packages/plugin.nix
+++ b/nix/packages/plugin.nix
@@ -60,7 +60,7 @@ in
     cargoBuildFlags = ["-p ${name}"];
     buildAndTestSubdir = "plugins/${name}";
 
-    CARGO_BUILD_INCREMENTAL = 0;
+    CARGO_BUILD_INCREMENTAL = "false";
     RUST_BACKTRACE = "full";
 
     meta = {