diff --git a/haskell-platform.spec b/haskell-platform.spec
index 3c4f479..b21f04f 100644
--- a/haskell-platform.spec
+++ b/haskell-platform.spec
@@ -94,11 +94,11 @@ mv packages/* .
 
 
 %build
-%ghc_libs_build $(grep \-e \-v "^(%{?separate_packages})-[0-9]" etc/build.packages)
+%ghc_libs_build $(grep \-E \-v "^(%{?separate_packages})-[0-9]" etc/build.packages)
 
 
 %install
-%ghc_libs_install $(grep \-e \-v "^(%{?separate_packages})-[0-9]" etc/build.packages)
+%ghc_libs_install $(grep \-E \-v "^(%{?separate_packages})-[0-9]" etc/build.packages)
 %ghc_strip_dynlinked