diff --git a/rzk/package.yaml b/rzk/package.yaml
index a76e7f9f2..2f9dccdd4 100644
--- a/rzk/package.yaml
+++ b/rzk/package.yaml
@@ -35,7 +35,7 @@ custom-setup:
 build-tools:
   alex:   ">= 3.2.4"
   happy:  ">= 1.19.9"
-  BNFC:   ">= 2.9.4.1"
+  BNFC:bnfc:   ">= 2.9.4.1"
 
 dependencies:
   array: ">= 0.5.3.0"
diff --git a/rzk/rzk.cabal b/rzk/rzk.cabal
index 7a39c812c..b11b1ce2d 100644
--- a/rzk/rzk.cabal
+++ b/rzk/rzk.cabal
@@ -61,7 +61,7 @@ library
       alex >=3.2.4
     , happy >=1.19.9
   build-tool-depends:
-      BNFC:BNFC >=2.9.4.1
+      BNFC:bnfc >=2.9.4.1
   build-depends:
       Glob >=0.9.3
     , array >=0.5.3.0
@@ -104,7 +104,7 @@ executable rzk
       alex >=3.2.4
     , happy >=1.19.9
   build-tool-depends:
-      BNFC:BNFC >=2.9.4.1
+      BNFC:bnfc >=2.9.4.1
   build-depends:
       Glob >=0.9.3
     , array >=0.5.3.0
@@ -133,7 +133,7 @@ test-suite doctests
       alex >=3.2.4
     , happy >=1.19.9
   build-tool-depends:
-      BNFC:BNFC >=2.9.4.1
+      BNFC:bnfc >=2.9.4.1
   build-depends:
       Glob
     , QuickCheck
@@ -162,7 +162,7 @@ test-suite rzk-test
       alex >=3.2.4
     , happy >=1.19.9
   build-tool-depends:
-      BNFC:BNFC >=2.9.4.1
+      BNFC:bnfc >=2.9.4.1
   build-depends:
       Glob >=0.9.3
     , array >=0.5.3.0