diff --git a/opam b/opam
index 46cecb6497b093bad6103bd8422fe2362a7a878b..71ba2dffaf19797df07e08cc15bdcfd372b90194 100644
--- a/opam
+++ b/opam
@@ -11,7 +11,7 @@ build: [make "-j%{jobs}%"]
 install: [make "install"]
 remove: ["sh" "-c" "rm -rf '%{lib}%/coq/user-contrib/iris'"]
 depends: [
-  "coq" { (>= "8.6.1" & < "8.8~") }
-  "coq-mathcomp-ssreflect" { ((>= "1.6.1" & < "1.7~") | (= "dev")) }
-  "coq-stdpp" { ((= "dev.2017-09-18.4") | (= "dev")) }
+  "coq" { >= "8.6.1" & < "8.8~" }
+  "coq-mathcomp-ssreflect" { (>= "1.6.1" & < "1.7~") | (= "dev") }
+  "coq-stdpp" { (= "dev.2017-09-18.4") | (= "dev") }
 ]