diff --git a/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/ModFileResourcePackMixin.java b/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/ModFileResourcePackMixin.java
index 9e11a02a..f4e7d0e9 100644
--- a/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/ModFileResourcePackMixin.java
+++ b/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/ModFileResourcePackMixin.java
@@ -5,20 +5,18 @@ import net.minecraft.server.packs.PackType;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraftforge.fml.loading.moddiscovery.ModFile;
 import net.minecraftforge.fml.packs.ModFileResourcePack;
-import org.embeddedt.modernfix.ModernFix;
+import org.embeddedt.modernfix.util.FileUtil;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.Redirect;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 import java.io.IOException;
 import java.nio.file.FileSystem;
-import java.nio.file.FileVisitOption;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
@@ -96,7 +94,7 @@ public abstract class ModFileResourcePackMixin {
 
     @Inject(method = "hasResource(Ljava/lang/String;)Z", at = @At(value = "HEAD"), cancellable = true)
     private void useCacheForExistence(String path, CallbackInfoReturnable<Boolean> cir) {
-        cir.setReturnValue(this.containedPaths.contains(path));
+        cir.setReturnValue(this.containedPaths.contains(FileUtil.normalize(path)));
     }
 
     /**
diff --git a/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/VanillaPackMixin.java b/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/VanillaPackMixin.java
index d3e133a6..018f0cd5 100644
--- a/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/VanillaPackMixin.java
+++ b/src/main/java/org/embeddedt/modernfix/mixin/perf/resourcepacks/VanillaPackMixin.java
@@ -10,6 +10,7 @@ import net.minecraft.resources.ResourceLocation;
 import org.apache.commons.lang3.tuple.Pair;
 import org.embeddedt.modernfix.FileWalker;
 import org.embeddedt.modernfix.ModernFix;
+import org.embeddedt.modernfix.util.FileUtil;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
@@ -71,6 +72,6 @@ public class VanillaPackMixin {
 
     @Inject(method = "hasResource", at = @At(value = "INVOKE", target = "Ljava/lang/Class;getResource(Ljava/lang/String;)Ljava/net/URL;"), cancellable = true)
     private void useCacheForExistence(PackType type, ResourceLocation location, CallbackInfoReturnable<Boolean> cir) {
-        cir.setReturnValue(containedPaths.contains(type.getDirectory() + "/" + location.getNamespace() + "/" + location.getPath()));
+        cir.setReturnValue(containedPaths.contains(type.getDirectory() + "/" + location.getNamespace() + "/" + FileUtil.normalize(location.getPath())));
     }
 }
diff --git a/src/main/java/org/embeddedt/modernfix/util/FileUtil.java b/src/main/java/org/embeddedt/modernfix/util/FileUtil.java
index 7e8dda59..51045bda 100644
--- a/src/main/java/org/embeddedt/modernfix/util/FileUtil.java
+++ b/src/main/java/org/embeddedt/modernfix/util/FileUtil.java
@@ -1,10 +1,22 @@
 package org.embeddedt.modernfix.util;
 
 import java.io.File;
+import java.util.regex.Pattern;
 
 public class FileUtil {
     public static File childFile(File file) {
         file.getParentFile().mkdirs();
         return file;
     }
+
+    private static final Pattern SLASH_PATTERN = Pattern.compile("(?:\\\\+|\\/+)");
+
+    /**
+     * Normalize a path by removing double slashes, etc.
+     * @param path input path
+     * @return a normalized version of the path
+     */
+    public static String normalize(String path) {
+        return SLASH_PATTERN.matcher(path).replaceAll("/");
+    }
 }