diff --git a/modules/holochain-cross.nix b/modules/holochain-cross.nix
index 0f0ac94..e87da92 100644
--- a/modules/holochain-cross.nix
+++ b/modules/holochain-cross.nix
@@ -82,7 +82,7 @@ let
         # See: https://doc.rust-lang.org/cargo/reference/config.html#target
         CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "${stdenv.cc.targetPrefix}cc";
         CARGO_TARGET_AARCH64_UNKNOWN_APPLE_LINKER = "${stdenv.cc.targetPrefix}cc";
-        CARGO_PROFILE="release";
+        CARGO_PROFILE = "release";
 
         # Tell cargo which target we want to build (so it doesn't default to the build system).
         cargoExtraArgs = "--target ${rustTargetTriple}";
diff --git a/modules/holochain-windows.nix b/modules/holochain-windows.nix
index ed067dd..b14e6f3 100644
--- a/modules/holochain-windows.nix
+++ b/modules/holochain-windows.nix
@@ -55,7 +55,7 @@ let
     doCheck = false;
 
     CARGO_BUILD_TARGET = "x86_64-pc-windows-gnu";
-    CARGO_PROFILE="release";
+    CARGO_PROFILE = "release";
 
     # fixes issues related to libring
     TARGET_CC = "${pkgs.pkgsCross.mingwW64.stdenv.cc}/bin/${pkgs.pkgsCross.mingwW64.stdenv.cc.targetPrefix}cc";
diff --git a/modules/lair-keystore-cross.nix b/modules/lair-keystore-cross.nix
index 120f953..e24189c 100644
--- a/modules/lair-keystore-cross.nix
+++ b/modules/lair-keystore-cross.nix
@@ -79,7 +79,7 @@ let
         # See: https://doc.rust-lang.org/cargo/reference/config.html#target
         CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "${stdenv.cc.targetPrefix}cc";
         CARGO_TARGET_AARCH64_UNKNOWN_APPLE_LINKER = "${stdenv.cc.targetPrefix}cc";
-        CARGO_PROFILE="release";
+        CARGO_PROFILE = "release";
 
         # Tell cargo which target we want to build (so it doesn't default to the build system).
         cargoExtraArgs = "--target ${rustTargetTriple}";
diff --git a/modules/lair-keystore-windows.nix b/modules/lair-keystore-windows.nix
index fc59452..761f3e8 100644
--- a/modules/lair-keystore-windows.nix
+++ b/modules/lair-keystore-windows.nix
@@ -36,7 +36,7 @@ let
     doCheck = false;
 
     CARGO_BUILD_TARGET = "x86_64-pc-windows-gnu";
-    CARGO_PROFILE="release";
+    CARGO_PROFILE = "release";
 
     # fixes issues related to libring
     TARGET_CC = "${pkgs.pkgsCross.mingwW64.stdenv.cc}/bin/${pkgs.pkgsCross.mingwW64.stdenv.cc.targetPrefix}cc";