diff --git a/stack-8.2.2.yaml b/stack-8.2.2.yaml
index 184c45494..65b0415e0 100644
--- a/stack-8.2.2.yaml
+++ b/stack-8.2.2.yaml
@@ -33,6 +33,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - sorted-list-0.2.1.0
 - syz-0.2.0.0
+# To make build work in windows 7
+- unix-time-0.4.7
 
 flags:
   haskell-ide-engine:
diff --git a/stack-8.4.2.yaml b/stack-8.4.2.yaml
index 2a908d531..ec92a9c33 100644
--- a/stack-8.4.2.yaml
+++ b/stack-8.4.2.yaml
@@ -32,6 +32,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - windns-0.1.0.0
 - yaml-0.8.32
 - yi-rope-0.11
diff --git a/stack-8.4.3.yaml b/stack-8.4.3.yaml
index 67b6df6e3..f8d756903 100644
--- a/stack-8.4.3.yaml
+++ b/stack-8.4.3.yaml
@@ -31,6 +31,8 @@ extra-deps:
 - pretty-show-1.8.2
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
+# To make build work in windows 7
+- unix-time-0.4.7
 - temporary-1.2.1.1
 
 flags:
diff --git a/stack-8.4.4.yaml b/stack-8.4.4.yaml
index 3037eff15..30200043a 100644
--- a/stack-8.4.4.yaml
+++ b/stack-8.4.4.yaml
@@ -31,6 +31,8 @@ extra-deps:
 - pretty-show-1.9.5
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
+# To make build work in windows 7
+- unix-time-0.4.7
 - temporary-1.2.1.1
 
 flags:
diff --git a/stack-8.6.1.yaml b/stack-8.6.1.yaml
index faa4c3080..1479408ec 100644
--- a/stack-8.6.1.yaml
+++ b/stack-8.6.1.yaml
@@ -38,6 +38,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags:
diff --git a/stack-8.6.2.yaml b/stack-8.6.2.yaml
index 2ca931f02..2fc6e881f 100644
--- a/stack-8.6.2.yaml
+++ b/stack-8.6.2.yaml
@@ -31,6 +31,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags:
diff --git a/stack-8.6.3.yaml b/stack-8.6.3.yaml
index 18cfecaa3..14059e83b 100644
--- a/stack-8.6.3.yaml
+++ b/stack-8.6.3.yaml
@@ -32,6 +32,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags:
diff --git a/stack-8.6.4.yaml b/stack-8.6.4.yaml
index e9451f6ae..5df504e5c 100644
--- a/stack-8.6.4.yaml
+++ b/stack-8.6.4.yaml
@@ -30,6 +30,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags:
diff --git a/stack-8.6.5.yaml b/stack-8.6.5.yaml
index 4d031beba..e24840307 100644
--- a/stack-8.6.5.yaml
+++ b/stack-8.6.5.yaml
@@ -30,6 +30,8 @@ extra-deps:
 - rope-utf16-splay-0.3.1.0
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags:
diff --git a/stack.yaml b/stack.yaml
index 0bf95c7a7..82b19111e 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -31,6 +31,8 @@ extra-deps:
 - multistate-0.8.0.1
 - syz-0.2.0.0
 - temporary-1.2.1.1
+# To make build work in windows 7
+- unix-time-0.4.7
 - yaml-0.8.32
 
 flags: