diff --git a/src/builder/import.rs b/src/builder/import.rs
index 7a5adb5..49f8e90 100644
--- a/src/builder/import.rs
+++ b/src/builder/import.rs
@@ -95,7 +95,7 @@ impl<F> ImportExternalBuilder<F> where F: Invoke<elements::External> {
 
 	/// Memory mapping with specified limits
 	pub fn memory(mut self, min: u32, max: Option<u32>) -> F::Result {
-		self.binding = elements::External::Memory(elements::MemoryType::new(min, max));
+		self.binding = elements::External::Memory(elements::MemoryType::new(min, max, false));
 		self.callback.invoke(self.binding)
 	}
 
diff --git a/src/builder/module.rs b/src/builder/module.rs
index 16e7b42..077bd44 100644
--- a/src/builder/module.rs
+++ b/src/builder/module.rs
@@ -206,7 +206,7 @@ impl<F> ModuleBuilder<F> where F: Invoke<elements::Module> {
 	/// Push linear memory region
 	pub fn push_memory(&mut self, mut memory: memory::MemoryDefinition) -> u32 {
 		let entries = self.module.memory.entries_mut();
-		entries.push(elements::MemoryType::new(memory.min, memory.max));
+		entries.push(elements::MemoryType::new(memory.min, memory.max, false));
 		let memory_index = (entries.len() - 1) as u32;
 		for data in memory.data.drain(..) {
 			self.module.data.entries_mut()
diff --git a/src/elements/import_entry.rs b/src/elements/import_entry.rs
index 7708d3a..2db95d2 100644
--- a/src/elements/import_entry.rs
+++ b/src/elements/import_entry.rs
@@ -162,9 +162,14 @@ pub struct MemoryType(ResizableLimits);
 
 impl MemoryType {
 	/// New memory definition
-	pub fn new(min: u32, max: Option<u32>) -> Self {
-		MemoryType(ResizableLimits::new(min, max))
+	pub fn new(min: u32, max: Option<u32>, shared: bool) -> Self {
+		let mut r = ResizableLimits::new(min, max);
+		if shared {
+			r.flags |= 0x2;
+		}
+		MemoryType(r)
 	}
+
 	/// Limits of the memory entry.
 	pub fn limits(&self) -> &ResizableLimits {
 		&self.0