diff --git a/Makefile.zarch b/Makefile.zarch
index be1e34f6d..b841d9b4d 100644
--- a/Makefile.zarch
+++ b/Makefile.zarch
@@ -8,3 +8,9 @@ ifeq ($(CORE), Z14)
 CCOMMON_OPT += -march=z14 -mzvector -O3
 FCOMMON_OPT += -march=z14 -mzvector
 endif
+
+# Enable floating-point expression contraction for clang, since it is the
+# default for gcc
+ifeq ($(C_COMPILER), CLANG)
+CCOMMON_OPT += -ffp-contract=fast
+endif