diff --git a/uefi-raw/src/table/boot.rs b/uefi-raw/src/table/boot.rs
index 2e1b36b2c..2f4382667 100644
--- a/uefi-raw/src/table/boot.rs
+++ b/uefi-raw/src/table/boot.rs
@@ -498,6 +498,7 @@ mod tests {
         let descs = [
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
+                _pad0: 0,
                 phys_start: 0x1000,
                 virt_start: 0x1000,
                 page_count: 1,
diff --git a/uefi/src/mem/memory_map/impl_.rs b/uefi/src/mem/memory_map/impl_.rs
index 21814cae5..dfa3e2ab8 100644
--- a/uefi/src/mem/memory_map/impl_.rs
+++ b/uefi/src/mem/memory_map/impl_.rs
@@ -432,6 +432,7 @@ mod tests {
     const BASE_MMAP_UNSORTED: [MemoryDescriptor; 3] = [
         MemoryDescriptor {
             ty: MemoryType::CONVENTIONAL,
+            _pad0: 0,
             phys_start: 0x3000,
             virt_start: 0x3000,
             page_count: 1,
@@ -439,6 +440,7 @@ mod tests {
         },
         MemoryDescriptor {
             ty: MemoryType::CONVENTIONAL,
+            _pad0: 0,
             phys_start: 0x2000,
             virt_start: 0x2000,
             page_count: 1,
@@ -446,6 +448,7 @@ mod tests {
         },
         MemoryDescriptor {
             ty: MemoryType::CONVENTIONAL,
+            _pad0: 0,
             phys_start: 0x1000,
             virt_start: 0x1000,
             page_count: 1,
diff --git a/uefi/src/mem/memory_map/mod.rs b/uefi/src/mem/memory_map/mod.rs
index 46cd82903..e454506f9 100644
--- a/uefi/src/mem/memory_map/mod.rs
+++ b/uefi/src/mem/memory_map/mod.rs
@@ -131,6 +131,7 @@ mod tests_mmap_artificial {
 
         const BASE: MemoryDescriptor = MemoryDescriptor {
             ty: TY,
+            _pad0: 0,
             phys_start: 0,
             virt_start: 0,
             page_count: 0,
@@ -169,6 +170,7 @@ mod tests_mmap_artificial {
 
         const BASE: MemoryDescriptor = MemoryDescriptor {
             ty: TY,
+            _pad0: 0,
             phys_start: 0,
             virt_start: 0,
             page_count: 0,
@@ -278,6 +280,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
@@ -288,6 +291,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::BOOT_SERVICES_DATA,
@@ -298,6 +302,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
@@ -308,6 +313,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
@@ -318,6 +324,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::ACPI_NON_VOLATILE,
@@ -328,6 +335,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
@@ -338,6 +346,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::ACPI_NON_VOLATILE,
@@ -348,6 +357,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::CONVENTIONAL,
@@ -358,6 +368,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
             MemoryDescriptor {
                 ty: MemoryType::ACPI_NON_VOLATILE,
@@ -368,6 +379,7 @@ mod tests_mmap_real {
                     | MemoryAttribute::WRITE_COMBINE
                     | MemoryAttribute::WRITE_THROUGH
                     | MemoryAttribute::WRITE_BACK,
+                ..Default::default()
             },
         ];
         assert_eq!(entries.as_slice(), &expected);
diff --git a/uefi/tests/memory_map.rs b/uefi/tests/memory_map.rs
index 0d7be6191..c41cdd83f 100644
--- a/uefi/tests/memory_map.rs
+++ b/uefi/tests/memory_map.rs
@@ -12,6 +12,7 @@ fn parse_boot_information_efi_mmap() {
             virt_start: 0x3000,
             page_count: 1,
             att: MemoryAttribute::WRITE_BACK,
+            ..Default::default()
         },
         MemoryDescriptor {
             ty: MemoryType::CONVENTIONAL,
@@ -19,6 +20,7 @@ fn parse_boot_information_efi_mmap() {
             virt_start: 0x2000,
             page_count: 1,
             att: MemoryAttribute::WRITE_BACK,
+            ..Default::default()
         },
         MemoryDescriptor {
             ty: MemoryType::CONVENTIONAL,
@@ -26,6 +28,7 @@ fn parse_boot_information_efi_mmap() {
             virt_start: 0x1000,
             page_count: 1,
             att: MemoryAttribute::WRITE_BACK,
+            ..Default::default()
         },
     ];
     let map_size = mmap_source.len() * desc_size;