diff --git a/src/main/java/dan200/computercraft/shared/peripheral/generic/GenericPeripheralProvider.java b/src/main/java/dan200/computercraft/shared/peripheral/generic/GenericPeripheralProvider.java
index 35ff9e668..067bc13e0 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/generic/GenericPeripheralProvider.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/generic/GenericPeripheralProvider.java
@@ -45,7 +45,7 @@ public class GenericPeripheralProvider
 
         for( Capability<?> capability : capabilities )
         {
-            LazyOptional<?> wrapper = tile.getCapability( capability );
+            LazyOptional<?> wrapper = CapabilityUtil.getCapability( tile, capability, side );
             wrapper.ifPresent( contents -> {
                 List<NamedMethod<PeripheralMethod>> capabilityMethods = PeripheralMethod.GENERATOR.getMethods( contents.getClass() );
                 if( capabilityMethods.isEmpty() ) return;
diff --git a/src/main/java/dan200/computercraft/shared/util/CapabilityUtil.java b/src/main/java/dan200/computercraft/shared/util/CapabilityUtil.java
index 482269cd2..1d14e55a6 100644
--- a/src/main/java/dan200/computercraft/shared/util/CapabilityUtil.java
+++ b/src/main/java/dan200/computercraft/shared/util/CapabilityUtil.java
@@ -5,9 +5,13 @@
  */
 package dan200.computercraft.shared.util;
 
+import net.minecraft.util.Direction;
+import net.minecraftforge.common.capabilities.Capability;
+import net.minecraftforge.common.capabilities.ICapabilityProvider;
 import net.minecraftforge.common.util.LazyOptional;
 import net.minecraftforge.common.util.NonNullConsumer;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
 public final class CapabilityUtil
@@ -57,4 +61,21 @@ public final class CapabilityUtil
     {
         return !p.isPresent() ? null : p.orElseThrow( NullPointerException::new );
     }
+
+    /**
+     * Find a capability, preferring the internal/null side but falling back to a given side if a mod doesn't support
+     * the internal one.
+     *
+     * @param provider   The capability provider to get the capability from.
+     * @param capability The capability to get.
+     * @param side       The side we'll fall back to.
+     * @param <T>        The type of the underlying capability.
+     * @return The extracted capability, if present.
+     */
+    @Nonnull
+    public static <T> LazyOptional<T> getCapability( ICapabilityProvider provider, Capability<T> capability, Direction side )
+    {
+        LazyOptional<T> cap = provider.getCapability( capability );
+        return cap.isPresent() ? cap : provider.getCapability( capability, side );
+    }
 }