diff --git a/libraries/AP_HAL_SMACCM/Util.cpp b/libraries/AP_HAL_SMACCM/Util.cpp
deleted file mode 100644
index 162a5f3d77..0000000000
--- a/libraries/AP_HAL_SMACCM/Util.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-
-#include "Util.h"
-using namespace SMACCM;
-
-int SMACCMUtil::snprintf(char* str, size_t size, const char *format, ...)
-{
-    va_list ap;
-    va_start(ap, format);
-    int res = this->vsnprintf(str, size, format, ap);
-    va_end(ap);
-    return res;
-}
-
-int SMACCMUtil::snprintf_P(char* str, size_t size, const prog_char_t *format, ...)
-{
-    va_list ap;
-    va_start(ap, format);
-    int res = this->vsnprintf_P(str, size, format, ap);
-    va_end(ap);
-    return res;
-}
-
-
-int SMACCMUtil::vsnprintf(char* str, size_t size, const char *format, va_list ap)
-{
-    return 0;
-}
-
-int SMACCMUtil::vsnprintf_P(char* str, size_t size, const prog_char_t *format,
-            va_list ap)
-{
-    return 0;
-}
-
-
diff --git a/libraries/AP_HAL_SMACCM/Util.h b/libraries/AP_HAL_SMACCM/Util.h
index a53e86305b..d03b24341e 100644
--- a/libraries/AP_HAL_SMACCM/Util.h
+++ b/libraries/AP_HAL_SMACCM/Util.h
@@ -7,11 +7,6 @@
 
 class SMACCM::SMACCMUtil : public AP_HAL::Util {
 public:
-    int snprintf(char* str, size_t size, const char *format, ...);
-    int snprintf_P(char* str, size_t size, const prog_char_t *format, ...);
-    int vsnprintf(char* str, size_t size, const char *format, va_list ap);
-    int vsnprintf_P(char* str, size_t size, const prog_char_t *format,
-            va_list ap);
     bool run_debug_shell(AP_HAL::BetterStream *stream) { return false; }
 };