diff --git a/opal/runtime/opal_params.c b/opal/runtime/opal_params.c
index e57eba23ab..d6818e5daf 100644
--- a/opal/runtime/opal_params.c
+++ b/opal/runtime/opal_params.c
@@ -71,6 +71,7 @@ int opal_register_params(void)
         mca_base_param_reg_string_name("opal", "signal", 
                                        "If a signal is received, display the stack trace frame",
                                        false, false, string, NULL);
+        free(string);
     }
 
 #if OMPI_ENABLE_DEBUG
diff --git a/opal/util/stacktrace.c b/opal/util/stacktrace.c
index 75902ee5df..2490c80e38 100644
--- a/opal/util/stacktrace.c
+++ b/opal/util/stacktrace.c
@@ -416,6 +416,7 @@ int opal_util_register_stackhandlers (void)
         return OPAL_ERR_IN_ERRNO;
       }
     }
+    free(string_value);
 #endif /* OMPI_WANT_PRETTY_PRINT_STACKTRACE && ! defined(__WINDOWS__) */
 
     return OPAL_SUCCESS;
diff --git a/orte/util/pre_condition_transports.c b/orte/util/pre_condition_transports.c
index 9a078d0350..df667bb678 100644
--- a/orte/util/pre_condition_transports.c
+++ b/orte/util/pre_condition_transports.c
@@ -154,6 +154,7 @@ int orte_pre_condition_transports(orte_app_context_t **app_context, size_t num_c
     }
 
     free(cs_env);
+    free(string_key);
 
     return ORTE_SUCCESS;
 }