diff --git a/openexr.spec b/openexr.spec
index b983bf3..8ffbd0e 100644
--- a/openexr.spec
+++ b/openexr.spec
@@ -138,15 +138,16 @@ export CXXFLAGS="%{optflags} -O0"
    --enable-imffuzztest \
    --enable-imfhugetest
 %if %{asan_build}
-for i in $(find -name Makefile | grep -v 'IlmImf/Makefile'); do
+vmemlimit=$(ulimit -v)
+if [ $vmemlimit != unlimited ]; then
+  echo "ulimit -v has to be unlimited (currently $vmemlimit) to run ASAN build"
+  exit 1
+fi
+for i in $(find -name Makefile); do
   sed -i -e 's/\(^CXXFLAGS.*\)/\1 -fsanitize=address/' \
          -e 's/\(^LIBS =.*\)/\1 -lasan/' \
          $i
 done
-# IlmImf/Makefile requires special handling: IlmImf/b44ExpLogTable and IlmImf/eLut
-# helpers will run during build; but asan is not compatible with ulimit -v limitation
-sed -i -e 's/\($(AM_V_CXX)$(LTCXXCOMPILE)\)/\1 -fsanitize=address/' IlmImf/Makefile
-sed -i -e 's/\(^libIlmImf_la_LIBADD.*\)/\1 -lasan/' IlmImf/Makefile
 %endif
 make %{?_smp_mflags}