diff --git a/reason-parser/opam b/reason-parser/opam
index 5603516bf..79725a73e 100644
--- a/reason-parser/opam
+++ b/reason-parser/opam
@@ -23,7 +23,7 @@ build-test: [
 ]
 depends: [
   "ocamlfind"               {build}
-  "menhir"                  {>= "20160303"}
+  "menhir"                  {= "20170101"}
   "merlin-extend"           {>= "0.3"}
   "result"                  {=  "1.2"}
   "topkg"                   {=  "0.8.1"}
diff --git a/reason-parser/opam.in b/reason-parser/opam.in
index 77c10b77a..1ff610f8f 100644
--- a/reason-parser/opam.in
+++ b/reason-parser/opam.in
@@ -22,7 +22,7 @@ build-test: [
 ]
 depends: [
   "ocamlfind"               {build}
-  "menhir"                  {>= "20160303"}
+  "menhir"                  {= "20170101"}
   "merlin-extend"           {>= "0.3"}
   "result"                  {=  "1.2"}
   "topkg"                   {=  "0.8.1"}