diff --git a/CMakeLists.txt b/CMakeLists.txt
index a6a80d9d1..d6007ad97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,7 +83,7 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
 
 set(OPTIMIZE "-O3" CACHE STRING "Optimization level")
-set(C_CXX_FLAGS "-Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wmissing-declarations -Woverloaded-virtual -pedantic-errors -Wno-deprecated")
+set(C_CXX_FLAGS "-Wall -Wno-narrowing -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wmissing-declarations -Woverloaded-virtual -pedantic-errors -Wno-deprecated")
 if(OPENMP)
   set(C_CXX_FLAGS "-fopenmp ${C_CXX_FLAGS}")
 endif(OPENMP)
diff --git a/src/lower/lowerer_impl_imperative.cpp b/src/lower/lowerer_impl_imperative.cpp
index c1f614463..3c8814f24 100644
--- a/src/lower/lowerer_impl_imperative.cpp
+++ b/src/lower/lowerer_impl_imperative.cpp
@@ -1932,7 +1932,7 @@ std::vector<ir::Stmt> LowererImplImperative::constructInnerLoopCasePreamble(ir::
   for(size_t i = 0; i < coordComparisons.size(); ++i) {
     Expr nonZeroCase;
     if(coordComparisons[i].defined() && valueComparisons[i].defined()) {
-      nonZeroCase = conjunction({coordComparisons[i], valueComparisons[i]});
+      nonZeroCase = taco::ir::conjunction({coordComparisons[i], valueComparisons[i]});
     } else if (valueComparisons[i].defined()) {
       nonZeroCase = valueComparisons[i];
     } else if (coordComparisons[i].defined()) {