diff --git a/libstuff/SRandom.cpp b/libstuff/SRandom.cpp
index b6900dac6..c84dd8469 100644
--- a/libstuff/SRandom.cpp
+++ b/libstuff/SRandom.cpp
@@ -18,7 +18,7 @@ uint64_t SRandom::rand64() {
     return _distribution64(_generator);
 }
 
-string SRandom::randStr(uint& length) {
+string SRandom::randStr(unsigned& length) {
     string str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     string newstr;
     int pos;
diff --git a/libstuff/SRandom.h b/libstuff/SRandom.h
index a718a04cd..e2c59b1c3 100644
--- a/libstuff/SRandom.h
+++ b/libstuff/SRandom.h
@@ -10,7 +10,7 @@ class SRandom {
   public:
     static uint64_t rand64();
     static uint64_t limitedRand64(uint64_t min, uint64_t max);
-    static string randStr(uint& length);
+    static string randStr(unsigned& length);
 
   private:
     static mt19937_64 _generator;