diff --git a/src/ExprSynthesizer.cpp b/src/ExprSynthesizer.cpp
index a7a7629e6..2c7fa1f32 100644
--- a/src/ExprSynthesizer.cpp
+++ b/src/ExprSynthesizer.cpp
@@ -1567,18 +1567,18 @@ class StringConstTester : public BasicTester {
             buildEnv["COMPILE_CMD"] = GCC_CMD;
         std::vector<long long> build_succ = P.buildWithRepairedCode(CLANG_TEST_WRAP, buildEnv, code,macroCode,macroFile);
         if (build_succ.size()==0) {
-            outlog_printf(2, "Build failed!");
+            outlog_printf(2, "Build failed!\n");
             return std::map<NewCodeMapTy, double>();
         }
 
         bool passed = testNegativeCases(BenchProgram::EnvMapTy());
         if (!passed) {
-            outlog_printf(2, "Failed negative cases!");
+            outlog_printf(2, "Failed negative cases!\n");
             return std::map<NewCodeMapTy, double>();
         }
         passed = testPositiveCases(BenchProgram::EnvMapTy());
         if (!passed) {
-            outlog_printf(2, "Failed positive cases!");
+            outlog_printf(2, "Failed positive cases!\n");
             return std::map<NewCodeMapTy, double>();
         }
 
diff --git a/src/Main.cpp b/src/Main.cpp
index a6584944b..5e35d4fd4 100644
--- a/src/Main.cpp
+++ b/src/Main.cpp
@@ -114,7 +114,7 @@ int main(int argc, char* argv[]) {
     std::string run_work_dir = RunWorkDir.getValue();
 
     if ((config_file_name == "") && (run_work_dir == "")) {
-        outlog_printf(0, "Must specify configuration file or existing working directory!");
+        outlog_printf(0, "Must specify configuration file or existing working directory!\n");
         exit(1);
     }
 
diff --git a/src/RepairSearchEngine.cpp b/src/RepairSearchEngine.cpp
index e8d45ceeb..5f1659640 100644
--- a/src/RepairSearchEngine.cpp
+++ b/src/RepairSearchEngine.cpp
@@ -340,7 +340,7 @@ int RepairSearchEngine::run(const std::string &out_file, size_t try_at_least,
                 if (cnt == 0)
                     outlog_printf(1, "Repair process ends without working fix!!\n");
                 else
-                    outlog_printf(1, "Repair process ends!");
+                    outlog_printf(1, "Repair process ends!\n");
                 outlog_printf(1, "Total %lu different repair schemas!!!!\n", schema_cnt);
                 outlog_printf(1, "Total %lu different repair candidate templates for scoring!!!\n", candidate_cnt);
                 return 1;