diff --git a/FFTConvolver/convolver.cpp b/FFTConvolver/convolver.cpp
index 4589c8ed..55ad42f4 100644
--- a/FFTConvolver/convolver.cpp
+++ b/FFTConvolver/convolver.cpp
@@ -40,7 +40,7 @@ void convolver_init(const char* filename, int max_length)
     float buffer_l[size];
     float buffer_r[size];
     
-    int i;
+    unsigned int i;
     for (i=0; i<size; ++i)
     {
       buffer_l[i] = buffer[2*i+0];
diff --git a/common.c b/common.c
index 053abbe3..46654290 100644
--- a/common.c
+++ b/common.c
@@ -90,7 +90,7 @@ static volatile int requested_connection_state_to_output = 1;
 
 shairport_cfg config;
 
-volatile int debuglev = 0;
+static volatile int debuglev = 0;
 
 sigset_t pselect_sigset;
 
diff --git a/common.h b/common.h
index 3ac2f1a0..0d031d8b 100644
--- a/common.h
+++ b/common.h
@@ -259,7 +259,7 @@ int64_t ranarray64i();
 void resetFreeUDPPort();
 uint16_t nextFreeUDPPort();
 
-volatile int debuglev;
+static volatile int debuglev;
 void die(const char *format, ...);
 void warn(const char *format, ...);
 void inform(const char *format, ...);