diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 2afa0473..00934d8d 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -460,7 +460,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
 			PRIVATE
 			-fno-omit-frame-pointer
 			-fno-common
-#			-pedantic-errors
+			-pedantic-errors
 			-Wall
 			-Wextra
 			-Werror
@@ -477,7 +477,7 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 			PRIVATE
 			-fno-omit-frame-pointer
 			-fno-common
-#			-pedantic-errors
+			-pedantic-errors
 			-Wall
 			-Wextra
 			-Werror
diff --git a/test/syntax_check/CMakeLists.txt b/test/syntax_check/CMakeLists.txt
index e6316fc7..17e36bff 100644
--- a/test/syntax_check/CMakeLists.txt
+++ b/test/syntax_check/CMakeLists.txt
@@ -40,6 +40,7 @@ target_compile_options(tests
 	    PRIVATE
 		-fsyntax-only
 		-pedantic-errors
+		-Werror
 		-Wextra-semi
 		)
 endif ()
@@ -48,6 +49,7 @@ target_compile_options(tests
 	    PRIVATE
 		-fsyntax-only
 		-pedantic-errors
+		-Werror
 		-Wextra-semi
 		-Wextra-semi-stmt
 		-Wc++11-extra-semi