diff --git a/.travis.yml b/.travis.yml
index 0c3611d..ee31fa1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@ git:
   depth: 1
 
 install:
+  - nix-shell --argstr compiler ghc802 --run true
   - nix-shell --argstr compiler ghc822 --run true
   - nix-shell --argstr compiler ghc842 --run true
 
@@ -19,6 +20,9 @@ env:
     - NIXPKGS_TESTS=yes
     - MATCHING_TESTS=yes
   matrix:
+    - GHCVERSION=ghc802 STRICT=false TRACING=false PROFILING=false
+    - GHCVERSION=ghc802 STRICT=false TRACING=true  PROFILING=false
+    - GHCVERSION=ghc802 STRICT=false TRACING=true  PROFILING=true
     - GHCVERSION=ghc822 STRICT=true  TRACING=false PROFILING=false
     - GHCVERSION=ghc822 STRICT=true  TRACING=true  PROFILING=false
     - GHCVERSION=ghc822 STRICT=true  TRACING=true  PROFILING=true
@@ -28,6 +32,7 @@ env:
 
 matrix:
   allow_failures:
+    - env: GHCVERSION=ghc802 STRICT=true
     - env: GHCVERSION=ghc842 STRICT=true
   exclude:
     - env: GHCVERSION=ghc822 STRICT=false
diff --git a/default.nix b/default.nix
index f361811..e9ab69f 100644
--- a/default.nix
+++ b/default.nix
@@ -53,8 +53,13 @@ let inherit (nixpkgs) pkgs;
 in haskellPackages.developPackage {
   root = ./.;
 
-  source-overrides = {
-  };
+  source-overrides =
+    if compiler == "ghc802"
+    then {
+      lens-family-core = "1.2.1";
+      lens-family = "1.2.1";
+    }
+    else {};
 
   modifier = drv: pkgs.haskell.lib.overrideCabal drv (attrs: {
     testHaskellDepends = attrs.testHaskellDepends ++
diff --git a/hnix.cabal b/hnix.cabal
index 25b3b79..f18face 100644
--- a/hnix.cabal
+++ b/hnix.cabal
@@ -2,7 +2,7 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: c96b1d1f4cba42487a9e22b578ff0d761b8bbee4f2efc4da245e5fdbbe7bc718
+-- hash: 31f435d94958c0e380e53a0138b53ae04ca4c40bce738ee2522300be68e15ea3
 
 name:           hnix
 version:        0.5.1
@@ -503,8 +503,6 @@ library
     , http-client-tls
     , http-types
     , interpolate
-    , lens-family
-    , lens-family-core
     , lens-family-th
     , logict
     , megaparsec >=6.0 && <6.6
@@ -527,6 +525,13 @@ library
     , unordered-containers >=0.2.9 && <0.3
     , vector
     , xml
+  if flag(optimize)
+    ghc-options: -fexpose-all-unfoldings -fspecialise-aggressively -O2
+  if flag(tracing)
+    cpp-options: -DENABLE_TRACING=1
+  if os(linux) && impl(ghc < 8.2)
+    build-depends:
+        compact
   if !impl(ghcjs)
     build-depends:
         base16-bytestring
@@ -535,6 +540,17 @@ library
       , cryptohash-sha256
       , cryptohash-sha512
       , serialise
+  if impl(ghc < 8.1)
+    build-depends:
+        lens-family ==1.2.1
+      , lens-family-core ==1.2.1
+  else
+    build-depends:
+        lens-family >=1.2.2
+      , lens-family-core >=1.2.2
+  if impl(ghc < 8.4.0) && !flag(profiling)
+    build-depends:
+        ghc-datasize
   if impl(ghcjs)
     build-depends:
         hashable >=1.2.4 && <1.3
@@ -577,6 +593,13 @@ executable hnix
     , time
     , transformers
     , unordered-containers >=0.2.9 && <0.3
+  if flag(optimize)
+    ghc-options: -fexpose-all-unfoldings -fspecialise-aggressively -O2
+  if flag(tracing)
+    cpp-options: -DENABLE_TRACING=1
+  if os(linux) && impl(ghc < 8.2)
+    build-depends:
+        compact
   if !impl(ghcjs)
     build-depends:
         base16-bytestring
@@ -639,6 +662,13 @@ test-suite hnix-tests
     , transformers
     , unix
     , unordered-containers >=0.2.9 && <0.3
+  if flag(optimize)
+    ghc-options: -fexpose-all-unfoldings -fspecialise-aggressively -O2
+  if flag(tracing)
+    cpp-options: -DENABLE_TRACING=1
+  if os(linux) && impl(ghc < 8.2)
+    build-depends:
+        compact
   if !impl(ghcjs)
     build-depends:
         base16-bytestring
@@ -681,6 +711,13 @@ benchmark hnix-benchmarks
     , time
     , transformers
     , unordered-containers >=0.2.9 && <0.3
+  if flag(optimize)
+    ghc-options: -fexpose-all-unfoldings -fspecialise-aggressively -O2
+  if flag(tracing)
+    cpp-options: -DENABLE_TRACING=1
+  if os(linux) && impl(ghc < 8.2)
+    build-depends:
+        compact
   if !impl(ghcjs)
     build-depends:
         base16-bytestring
diff --git a/package.yaml b/package.yaml
index 05165c0..c0d4d99 100644
--- a/package.yaml
+++ b/package.yaml
@@ -53,17 +53,6 @@ flags:
 ghc-options:
   - -Wall
 
-when:
-  - condition: flag(optimize)
-    ghc-options:
-      - -fexpose-all-unfoldings
-      - -fspecialise-aggressively
-      - -O2
-
-when:
-  - condition: flag(tracing)
-    cpp-options: -DENABLE_TRACING=1
-
 dependencies:
   - base                        >= 4.9 && < 5
   - ansi-wl-pprint
@@ -83,11 +72,19 @@ dependencies:
   - unordered-containers        >= 0.2.9 && < 0.3
 
 when:
+  - condition: flag(optimize)
+    ghc-options:
+      - -fexpose-all-unfoldings
+      - -fspecialise-aggressively
+      - -O2
+
+  - condition: flag(tracing)
+    cpp-options: -DENABLE_TRACING=1
+
   - condition: "os(linux) && impl(ghc < 8.2)"
     dependencies:
       - compact
 
-when:
   - condition: "!impl(ghcjs)"
     dependencies:
       - base16-bytestring
@@ -110,8 +107,6 @@ library:
     - http-client
     - http-client-tls
     - interpolate
-    - lens-family
-    - lens-family-core
     - lens-family-th
     - logict
     - megaparsec                >= 6.0   && < 6.6
@@ -128,10 +123,20 @@ library:
     - vector
     - xml
   when:
-    - condition: impl(ghc < 8.4.0) && !flag(profiling)
+    - condition: "impl(ghc < 8.1)"
+      then:
+        dependencies:
+          - lens-family       == 1.2.1
+          - lens-family-core  == 1.2.1
+      else:
+        dependencies:
+          - lens-family       >= 1.2.2
+          - lens-family-core  >= 1.2.2
+
+    - condition: "impl(ghc < 8.4.0) && !flag(profiling)"
       dependencies:
         - ghc-datasize
-  when:
+
     - condition: "impl(ghcjs)"
       then:
         dependencies: