diff --git a/libprof.h b/libprof.h
index 02905a9..49f654e 100644
--- a/libprof.h
+++ b/libprof.h
@@ -58,7 +58,7 @@ extern uint32_t volatile *prof_tcnt;
    function was already executing then the deepest instance in the stack is
    used instead of creating a new counter. */
 #define prof_enter(prof) {				\
-	if(!prof.rec++) prof.elapsed += *prof_tcnt;	\
+	if(!(prof).rec++) (prof).elapsed += *prof_tcnt;	\
 }
 
 /* prof_leave(): Stop counting time for a function
@@ -67,15 +67,15 @@ extern uint32_t volatile *prof_tcnt;
    are not as exactly as many prof_leave()'s as prof_enter()'s then the
    resulting time measure will not be relevant at all. */
 #define prof_leave(prof) {				\
-	if(!--prof.rec) prof.elapsed -= *prof_tcnt;	\
+	if(!--(prof).rec) (prof).elapsed -= *prof_tcnt;	\
 }
 
 /* Variant of prof_enter()/prof_leave() for non-recursive contexts */
 #define prof_enter_norec(prof) {			\
-	prof.elapsed += *prof_tcnt;			\
+	(prof).elapsed += *prof_tcnt;			\
 }
 #define prof_leave_norec(prof) {			\
-	prof.elapsed -= *prof_tcnt;			\
+	(prof).elapsed -= *prof_tcnt;			\
 }
 
 /* prof_exec(): Measure a single block of code
@@ -87,11 +87,11 @@ extern uint32_t volatile *prof_tcnt;
            exec_code();
        }); */
 #define prof_exec(code) ({		\
-	prof_t prof = prof_make();	\
-	prof_enter(prof);		\
+	prof_t _prof = prof_make();	\
+	prof_enter(_prof);		\
 	code;				\
-	prof_leave(prof);		\
-	prof_time(prof);		\
+	prof_leave(_prof);		\
+	prof_time(_prof);		\
 })
 
 //---