diff --git a/tools/profiler/core/EHABIStackWalk.cpp b/tools/profiler/core/EHABIStackWalk.cpp
index 82ce0e085cf7..df9c797e860a 100644
--- a/tools/profiler/core/EHABIStackWalk.cpp
+++ b/tools/profiler/core/EHABIStackWalk.cpp
@@ -82,7 +82,7 @@ public:
   bool unwind(const EHEntry *aEntry, const void *stackBase);
   uint32_t &operator[](int i) { return mRegs[i]; }
   const uint32_t &operator[](int i) const { return mRegs[i]; }
-  EHState(const mcontext_t &);
+  explicit EHState(const mcontext_t &);
 };
 
 enum {
diff --git a/tools/profiler/lul/AutoObjectMapper.h b/tools/profiler/lul/AutoObjectMapper.h
index 93a03a7fb59b..338cd7c6593a 100644
--- a/tools/profiler/lul/AutoObjectMapper.h
+++ b/tools/profiler/lul/AutoObjectMapper.h
@@ -86,7 +86,7 @@ private:
 
 class MOZ_STACK_CLASS AutoObjectMapperFaultyLib : public AutoObjectMapperPOSIX {
 public:
-  AutoObjectMapperFaultyLib(void(*aLog)(const char*));
+  explicit AutoObjectMapperFaultyLib(void(*aLog)(const char*));
 
   ~AutoObjectMapperFaultyLib();