diff --git a/fastboot/fastboot_driver.cpp b/fastboot/fastboot_driver.cpp
index 6bd6128..f9e640a 100644
--- a/fastboot/fastboot_driver.cpp
+++ b/fastboot/fastboot_driver.cpp
@@ -126,7 +126,7 @@
     return RawCommand(Commands::FLASH + part);
 }
 
-RetCode FastBootDriver::Partitions(std::vector<std::tuple<std::string, uint32_t>>* parts) {
+RetCode FastBootDriver::Partitions(std::vector<std::tuple<std::string, uint64_t>>* parts) {
     std::vector<std::string> all;
     RetCode ret;
     if ((ret = GetVarAll(&all))) {
@@ -140,7 +140,7 @@
         if (std::regex_match(s, sm, reg)) {
             std::string m1(sm[1]);
             std::string m2(sm[2]);
-            uint32_t tmp = strtol(m2.c_str(), 0, 16);
+            uint64_t tmp = strtoll(m2.c_str(), 0, 16);
             parts->push_back(std::make_tuple(m1, tmp));
         }
     }
diff --git a/fastboot/fastboot_driver.h b/fastboot/fastboot_driver.h
index 2651690..ca9003a 100644
--- a/fastboot/fastboot_driver.h
+++ b/fastboot/fastboot_driver.h
@@ -99,7 +99,7 @@
     RetCode FlashPartition(const std::string& part, int fd, uint32_t sz);
     RetCode FlashPartition(const std::string& part, sparse_file* s);
 
-    RetCode Partitions(std::vector<std::tuple<std::string, uint32_t>>* parts);
+    RetCode Partitions(std::vector<std::tuple<std::string, uint64_t>>* parts);
     RetCode Require(const std::string& var, const std::vector<std::string>& allowed, bool* reqmet,
                     bool invert = false);
 
diff --git a/fastboot/fuzzy_fastboot/main.cpp b/fastboot/fuzzy_fastboot/main.cpp
index 1d30f8b..a7b22c6 100644
--- a/fastboot/fuzzy_fastboot/main.cpp
+++ b/fastboot/fuzzy_fastboot/main.cpp
@@ -304,7 +304,7 @@
 }
 
 TEST_F(Conformance, PartitionInfo) {
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed";
     EXPECT_GT(parts.size(), 0)
             << "getvar:all did not report any partition-size: through INFO responses";
@@ -340,7 +340,7 @@
     // Can't run out of alphabet letters...
     ASSERT_LE(num_slots, 26) << "What?! You can't have more than 26 slots";
 
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed";
 
     std::map<std::string, std::set<char>> part_slots;
@@ -587,14 +587,14 @@
     std::vector<char> buf{'a', 'o', 's', 'p'};
     EXPECT_EQ(fb->Download(buf), SUCCESS) << "Download failed in unlocked mode";
     ;
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed in unlocked mode";
 }
 
 TEST_F(LockPermissions, DownloadFlash) {
     std::vector<char> buf{'a', 'o', 's', 'p'};
     EXPECT_EQ(fb->Download(buf), SUCCESS) << "Download failed in locked mode";
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed in locked mode";
     std::string resp;
     for (const auto tup : parts) {
@@ -607,7 +607,7 @@
 }
 
 TEST_F(LockPermissions, Erase) {
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed";
     std::string resp;
     for (const auto tup : parts) {
@@ -619,7 +619,7 @@
 }
 
 TEST_F(LockPermissions, SetActive) {
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     EXPECT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed";
 
     std::string resp;
@@ -916,7 +916,7 @@
 
 TEST_P(AnyPartition, ReportedGetVarAll) {
     // As long as the partition is reported in INFO, it would be tested by generic Conformance
-    std::vector<std::tuple<std::string, uint32_t>> parts;
+    std::vector<std::tuple<std::string, uint64_t>> parts;
     ASSERT_EQ(fb->Partitions(&parts), SUCCESS) << "getvar:all failed";
     const std::string name = GetParam().first;
     if (GetParam().second.slots) {