diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index d67098e99e3465084595f17f8f5bb66225814045..27ec2eca6bbe6994cb27ea5062bb9221a38a3171 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -148,7 +148,6 @@ set(COMMON_FLAGS
     -Wno-unused-parameter
     -Wno-unused-function
     -Wno-error=literal-suffix
-    -Wno-error=sign-compare
     -Wno-error=unused-local-typedefs
     -Wno-error=parentheses-equality # Warnings in pybind11
     -Wno-error=ignored-attributes  # Warnings in Eigen, gcc 6.3
@@ -183,7 +182,6 @@ set(GPU_COMMON_FLAGS
     -Wdelete-non-virtual-dtor
     -Wno-unused-parameter
     -Wno-unused-function
-    -Wno-error=sign-compare
     -Wno-error=literal-suffix
     -Wno-error=unused-local-typedefs
     -Wno-error=unused-function  # Warnings in Numpy Header.