diff --git a/src/goto-symex/build_goto_trace.cpp b/src/goto-symex/build_goto_trace.cpp
index 0612b04e2df..7e938118ba7 100644
--- a/src/goto-symex/build_goto_trace.cpp
+++ b/src/goto-symex/build_goto_trace.cpp
@@ -224,7 +224,9 @@ void build_goto_trace(
           symex_target_equationt::assignment_typet::PHI ||
         SSA_step.assignment_type==
           symex_target_equationt::assignment_typet::GUARD))
+    {
       continue;
+    }
 
     goto_tracet::stepst &steps=time_map[current_time];
     steps.push_back(goto_trace_stept());
diff --git a/src/goto-symex/symex_target.h b/src/goto-symex/symex_target.h
index 2aae977f71f..eafea6d7e39 100644
--- a/src/goto-symex/symex_target.h
+++ b/src/goto-symex/symex_target.h
@@ -53,7 +53,12 @@ class symex_targett
 
   enum class assignment_typet
   {
-    STATE, HIDDEN, VISIBLE_ACTUAL_PARAMETER, HIDDEN_ACTUAL_PARAMETER, PHI, GUARD
+    STATE,
+    HIDDEN,
+    VISIBLE_ACTUAL_PARAMETER,
+    HIDDEN_ACTUAL_PARAMETER,
+    PHI,
+    GUARD,
   };
 
   // read event
diff --git a/src/goto-symex/symex_target_equation.cpp b/src/goto-symex/symex_target_equation.cpp
index 5b5206aff71..0b7bc15a955 100644
--- a/src/goto-symex/symex_target_equation.cpp
+++ b/src/goto-symex/symex_target_equation.cpp
@@ -1002,17 +1002,23 @@ void symex_target_equationt::SSA_stept::output(
     switch(assignment_type)
     {
     case assignment_typet::HIDDEN:
-      out << "HIDDEN"; break;
+      out << "HIDDEN";
+      break;
     case assignment_typet::STATE:
-      out << "STATE"; break;
+      out << "STATE";
+      break;
     case assignment_typet::VISIBLE_ACTUAL_PARAMETER:
-      out << "VISIBLE_ACTUAL_PARAMETER"; break;
+      out << "VISIBLE_ACTUAL_PARAMETER";
+      break;
     case assignment_typet::HIDDEN_ACTUAL_PARAMETER:
-      out << "HIDDEN_ACTUAL_PARAMETER"; break;
+      out << "HIDDEN_ACTUAL_PARAMETER";
+      break;
     case assignment_typet::PHI:
-      out << "PHI"; break;
+      out << "PHI";
+      break;
     case assignment_typet::GUARD:
-      out << "GUARD"; break;
+      out << "GUARD";
+      break;
     default:
       {
       }
diff --git a/src/goto-symex/symex_target_equation.h b/src/goto-symex/symex_target_equation.h
index e7f0274aac1..aac51725ad9 100644
--- a/src/goto-symex/symex_target_equation.h
+++ b/src/goto-symex/symex_target_equation.h
@@ -204,7 +204,7 @@ class symex_target_equationt:public symex_targett
     bool is_atomic_end() const      { return type==goto_trace_stept::typet::ATOMIC_END; }
 
     // we may choose to hide
-    bool hidden;
+    bool hidden=false;
 
     exprt guard;
     literalt guard_literal;
@@ -213,7 +213,7 @@ class symex_target_equationt:public symex_targett
     ssa_exprt ssa_lhs;
     exprt ssa_full_lhs, original_full_lhs;
     exprt ssa_rhs;
-    assignment_typet assignment_type;
+    assignment_typet assignment_type=assignment_typet::STATE;
 
     // for ASSUME/ASSERT/GOTO/CONSTRAINT
     exprt cond_expr;
@@ -222,7 +222,7 @@ class symex_target_equationt:public symex_targett
 
     // for INPUT/OUTPUT
     irep_idt format_string, io_id;
-    bool formatted;
+    bool formatted=false;
     std::list<exprt> io_args;
     std::list<exprt> converted_io_args;
 
@@ -230,10 +230,10 @@ class symex_target_equationt:public symex_targett
     irep_idt identifier;
 
     // for SHARED_READ/SHARED_WRITE and ATOMIC_BEGIN/ATOMIC_END
-    unsigned atomic_section_id;
+    unsigned atomic_section_id=0;
 
     // for slicing
-    bool ignore;
+    bool ignore=false;
 
     SSA_stept():
       type(goto_trace_stept::typet::NONE),