diff --git a/pkgs/development/coq-modules/QuickChick/default.nix b/pkgs/development/coq-modules/QuickChick/default.nix
index 34daebcdf528..96954eb43ace 100644
--- a/pkgs/development/coq-modules/QuickChick/default.nix
+++ b/pkgs/development/coq-modules/QuickChick/default.nix
@@ -28,7 +28,7 @@ let params =
       propagatedBuildInputs = [ coq-ext-lib simple-io ];
     };
   };
-  param = params."${coq.coq-version}" or params."8.8";
+  param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/coq-modules/Velisarios/default.nix b/pkgs/development/coq-modules/Velisarios/default.nix
index aa5ebb32b3ce..cd7ddfefb84a 100644
--- a/pkgs/development/coq-modules/Velisarios/default.nix
+++ b/pkgs/development/coq-modules/Velisarios/default.nix
@@ -20,7 +20,7 @@ let params =
       sha256 = "0l9885nxy0n955fj1gnijlxl55lyxiv9yjfmz8hmfrn9hl8vv1m2";
     };
   };
-  param = params."${coq.coq-version}" or params."8.8";
+  param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/coq-modules/category-theory/default.nix b/pkgs/development/coq-modules/category-theory/default.nix
index a8fd91d9d348..59f2295e2153 100644
--- a/pkgs/development/coq-modules/category-theory/default.nix
+++ b/pkgs/development/coq-modules/category-theory/default.nix
@@ -18,7 +18,7 @@ let
     "8.7" = v20180709;
     "8.8" = v20181016;
   };
-  param = params."${coq.coq-version}" or params."8.8";
+  param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/coq-modules/coq-haskell/default.nix b/pkgs/development/coq-modules/coq-haskell/default.nix
index 784e360a0dab..57f31e1847c1 100644
--- a/pkgs/development/coq-modules/coq-haskell/default.nix
+++ b/pkgs/development/coq-modules/coq-haskell/default.nix
@@ -26,7 +26,7 @@ let params =
       sha256 = "09dq1vvshhlhgjccrhqgbhnq2hrys15xryfszqq11rzpgvl2zgdv";
     };
   };
-  param = params."${coq.coq-version}" or params."8.8";
+  param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/coq-modules/coqprime/default.nix b/pkgs/development/coq-modules/coqprime/default.nix
index 265b97deca2c..191812b3f2eb 100644
--- a/pkgs/development/coq-modules/coqprime/default.nix
+++ b/pkgs/development/coq-modules/coqprime/default.nix
@@ -14,7 +14,7 @@ let params =
     "8.8" = v_8_8;
     "8.9" = v_8_8;
     };
-  param = params."${coq.coq-version}" or params."8.9"
+  param = params."${coq.coq-version}"
 ; in
 
 stdenv.mkDerivation rec {
diff --git a/pkgs/development/coq-modules/dpdgraph/default.nix b/pkgs/development/coq-modules/dpdgraph/default.nix
index 6a06c1b19875..e403f7d4fb5c 100644
--- a/pkgs/development/coq-modules/dpdgraph/default.nix
+++ b/pkgs/development/coq-modules/dpdgraph/default.nix
@@ -22,7 +22,7 @@ let params = {
     sha256 = "0qvar8gfbrcs9fmvkph5asqz4l5fi63caykx3bsn8zf0xllkwv0n";
   };
 };
-param = params."${coq.coq-version}" or params."8.8";
+param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation {
diff --git a/pkgs/development/coq-modules/equations/default.nix b/pkgs/development/coq-modules/equations/default.nix
index 1bc66fcf272a..86e5687321b4 100644
--- a/pkgs/development/coq-modules/equations/default.nix
+++ b/pkgs/development/coq-modules/equations/default.nix
@@ -26,7 +26,7 @@ let
       sha256 = "1sj7vyarmvp1w5kvbhgpgap1yd0yrj4n1jrla0wv70k0jrq5hhpz";
     };
   };
-  param = params."${coq.coq-version}" or params."8.8";
+  param = params."${coq.coq-version}";
 in
 
 stdenv.mkDerivation rec {