diff --git a/src/geopackage/CMakeLists.txt b/src/geopackage/CMakeLists.txt
index 97f25cdd98..14a8f1324d 100644
--- a/src/geopackage/CMakeLists.txt
+++ b/src/geopackage/CMakeLists.txt
@@ -3,12 +3,13 @@ cmake_minimum_required(VERSION 3.10)
 
 string(COMPARE EQUAL "${CMAKE_CXX_COMPILER_ID}" "IntelLLVM" _cmp)
 if (NOT _cmp)
-    message(WARNING "[NGen::geopackage] geometry.cpp cannot be optimized with "
-                    "${CMAKE_CXX_COMPILER_ID} due to a suspected compiler/boost issue. "
+    message(WARNING "[NGen::geopackage] wkb.cpp cannot be optimized with "
+                    "${CMAKE_CXX_COMPILER_ID} due to a suspected optimizer/boost issue:\n"
+                    "https://github.com/NOAA-OWP/ngen/issues/567.\n"
                     "Use IntelLLVM if optimization for this source file is required.")
     # !! Required due to optimizer issue with either clang or
     # !! boost::geometry::srs::transformation
-    set_source_files_properties(geometry.cpp PROPERTIES COMPILE_FLAGS -O0)
+    set_source_files_properties(wkb.cpp PROPERTIES COMPILE_FLAGS -O0)
 endif()
 
 add_library(geopackage STATIC geometry.cpp
diff --git a/test/geopackage/WKB_Test.cpp b/test/geopackage/WKB_Test.cpp
index f0732a979c..13d2819c80 100644
--- a/test/geopackage/WKB_Test.cpp
+++ b/test/geopackage/WKB_Test.cpp
@@ -147,12 +147,12 @@ TEST_F(WKB_Test, wkb_point_test) // also tests endianness
 {  
     const auto geom_big    = boost::get<wkb::point_t>(wkb::read(this->wkb_bytes["point_big"]));
     const auto geom_little = boost::get<wkb::point_t>(wkb::read(this->wkb_bytes["point"]));
-    EXPECT_NEAR(geom_big.get<0>(), geom_little.get<0>(), 0.000001);
-    EXPECT_NEAR(geom_big.get<1>(), geom_little.get<1>(), 0.000001);
-    EXPECT_NEAR(geom_big.get<0>(), 2.0, 0.000001);
-    EXPECT_NEAR(geom_big.get<1>(), 4.0, 0.000001);
-    EXPECT_NEAR(geom_big.get<0>(), 2.0, 0.000001);
-    EXPECT_NEAR(geom_big.get<1>(), 4.0, 0.000001);
+    EXPECT_NEAR(geom_big.get<0>(), geom_little.get<0>(), 1e-6);
+    EXPECT_NEAR(geom_big.get<1>(), geom_little.get<1>(), 1e-6);
+    EXPECT_NEAR(geom_big.get<0>(), 2.0, 1e-6);
+    EXPECT_NEAR(geom_big.get<1>(), 4.0, 1e-6);
+    EXPECT_NEAR(geom_big.get<0>(), 2.0, 1e-6);
+    EXPECT_NEAR(geom_big.get<1>(), 4.0, 1e-6);
 }
 
 TEST_F(WKB_Test, wkb_linestring_test)
@@ -166,8 +166,8 @@ TEST_F(WKB_Test, wkb_linestring_test)
     };
 
     for (int i = 0; i < expected_coordinates.size(); i++) {
-        EXPECT_NEAR(line[i].get<0>(), expected_coordinates[i].first, 0.0001);
-        EXPECT_NEAR(line[i].get<1>(), expected_coordinates[i].second, 0.0001);
+        EXPECT_NEAR(line[i].get<0>(), expected_coordinates[i].first, 1e-4);
+        EXPECT_NEAR(line[i].get<1>(), expected_coordinates[i].second, 1e-4);
     }
 }
 
@@ -186,8 +186,8 @@ TEST_F(WKB_Test, wkb_polygon_test)
     };
 
     for (int i = 0; i < expected_coordinates.size(); i++) {
-        EXPECT_NEAR(poly.outer().at(i).get<0>(), expected_coordinates[i].first, 0.0001);
-        EXPECT_NEAR(poly.outer().at(i).get<1>(), expected_coordinates[i].second, 0.0001);
+        EXPECT_NEAR(poly.outer().at(i).get<0>(), expected_coordinates[i].first, 1e-4);
+        EXPECT_NEAR(poly.outer().at(i).get<1>(), expected_coordinates[i].second, 1e-4);
     }
 }
 
@@ -208,8 +208,8 @@ TEST_F(WKB_Test, wkb_polygon_with_holes_test)
     };
 
     for (int i = 0; i < expected_outer.size(); i++) {
-        EXPECT_NEAR(poly.outer()[i].get<0>(), expected_outer[i].first, 0.0001);
-        EXPECT_NEAR(poly.outer()[i].get<1>(), expected_outer[i].second, 0.0001);
+        EXPECT_NEAR(poly.outer()[i].get<0>(), expected_outer[i].first, 1e-4);
+        EXPECT_NEAR(poly.outer()[i].get<1>(), expected_outer[i].second, 1e-4);
     }
 
     const std::vector<std::pair<double, double>> expected_inner = {
@@ -221,8 +221,8 @@ TEST_F(WKB_Test, wkb_polygon_with_holes_test)
     };
 
     for (int i = 0; i < expected_inner.size(); i++) {
-        EXPECT_NEAR(poly.inners().at(0)[i].get<0>(), expected_inner[i].first, 0.0001);
-        EXPECT_NEAR(poly.inners().at(0)[i].get<1>(), expected_inner[i].second, 0.0001);
+        EXPECT_NEAR(poly.inners().at(0)[i].get<0>(), expected_inner[i].first, 1e-4);
+        EXPECT_NEAR(poly.inners().at(0)[i].get<1>(), expected_inner[i].second, 1e-4);
     }
 }
 
@@ -237,8 +237,8 @@ TEST_F(WKB_Test, wkb_multipoint_test)
     };
 
     for (int i = 0; i < expected_coordinates.size(); i++) {
-        EXPECT_NEAR(mp[i].get<0>(), expected_coordinates[i].first, 0.0001);
-        EXPECT_NEAR(mp[i].get<1>(), expected_coordinates[i].second, 0.0001);
+        EXPECT_NEAR(mp[i].get<0>(), expected_coordinates[i].first, 1e-4);
+        EXPECT_NEAR(mp[i].get<1>(), expected_coordinates[i].second, 1e-4);
     }
 }
 
@@ -255,8 +255,8 @@ TEST_F(WKB_Test, wkb_multilinestring_test)
 
     for (int i = 0; i < expected_coordinates.size(); i++) {
         for (int j = 0; j < expected_coordinates[i].size(); j++) {
-            EXPECT_NEAR(mp[i][j].get<0>(), expected_coordinates[i][j].first, 0.0001);
-            EXPECT_NEAR(mp[i][j].get<1>(), expected_coordinates[i][j].second, 0.0001);
+            EXPECT_NEAR(mp[i][j].get<0>(), expected_coordinates[i][j].first, 1e-4);
+            EXPECT_NEAR(mp[i][j].get<1>(), expected_coordinates[i][j].second, 1e-4);
         }
     }
 }