diff --git a/src/notaries_staked.cpp b/src/notaries_staked.cpp
index 4f335a444..81d249d96 100644
--- a/src/notaries_staked.cpp
+++ b/src/notaries_staked.cpp
@@ -107,7 +107,7 @@ int is_STAKED() {
   return(STAKED);
 };
 
-int STAKED_era(uint32_t timestamp)
+int STAKED_era(int timestamp)
 {
   int era;
   if (timestamp <= STAKED_NOTARIES_TIMESTAMP)
diff --git a/src/notaries_staked.h b/src/notaries_staked.h
index 201f8cb40..84296d4e5 100644
--- a/src/notaries_staked.h
+++ b/src/notaries_staked.h
@@ -2,10 +2,10 @@
 #ifndef NOTARIES_STAKED
 #define NOTARIES_STAKED
 
-static const uint32_t STAKED_NOTARIES_TIMESTAMP = 1537780949;
-static const uint32_t STAKED_NOTARIES_TIMESTAMP1 = 1537791749;
-static const uint32_t STAKED_NOTARIES_TIMESTAMP2 = 1537802549;
-static const uint32_t STAKED_NOTARIES_TIMESTAMP3 = 1537813349;
+static const int STAKED_NOTARIES_TIMESTAMP = 1537780949;
+static const int STAKED_NOTARIES_TIMESTAMP1 = 1537791749;
+static const int STAKED_NOTARIES_TIMESTAMP2 = 1537802549;
+static const int STAKED_NOTARIES_TIMESTAMP3 = 1537813349;
 
 extern const char *notaries_STAKED[][2];
 extern int num_notaries_STAKED;
@@ -20,6 +20,6 @@ extern const char *notaries_STAKED3[][2];
 extern int num_notaries_STAKED3;
 
 int is_STAKED();
-int STAKED_era(uint32_t timestamp);
+int STAKED_era(int timestamp);
 
 #endif