diff --git a/configure.ac b/configure.ac
index 8d1a71a10462e2da2b80f960d49e4e6348c99ad0..98fffe1baedec54bae51af2bca8c21e123778227 100644
--- a/configure.ac
+++ b/configure.ac
@@ -627,7 +627,7 @@ AC_SUBST([LibtoolCmd])
 # tools we are looking for. In the past, GHC supported a number of
 # versions of LLVM simultaneously, but that stopped working around
 # 3.5/3.6 release of LLVM.
-LlvmVersion=4.0
+LlvmVersion=5.0
 AC_SUBST([LlvmVersion])
 sUPPORTED_LLVM_VERSION=$(echo \($LlvmVersion\) | sed 's/\./,/')
 AC_DEFINE_UNQUOTED([sUPPORTED_LLVM_VERSION], ${sUPPORTED_LLVM_VERSION}, [The supported LLVM version number])