diff --git a/include/pcg_uint128.hpp b/include/pcg_uint128.hpp
index 16f9264..a10f23e 100644
--- a/include/pcg_uint128.hpp
+++ b/include/pcg_uint128.hpp
@@ -140,14 +140,14 @@ inline bitcount_t flog2(uint32_t v)
 {
     unsigned long i;
     _BitScanReverse(&i, v);
-    return i;
+    return static_cast<bitcount_t>(i);
 }
 
 inline bitcount_t trailingzeros(uint32_t v)
 {
     unsigned long i;
     _BitScanForward(&i, v);
-    return i;
+    return static_cast<bitcount_t>(i);
 }
 
 inline bitcount_t flog2(uint64_t v)
@@ -155,7 +155,7 @@ inline bitcount_t flog2(uint64_t v)
 #if defined(_M_X64) || defined(_M_ARM) || defined(_M_ARM64)
     unsigned long i;
     _BitScanReverse64(&i, v);
-    return i;
+    return static_cast<bitcount_t>(i);
 #else
     // 32-bit x86
     uint32_t high = v >> 32;
@@ -169,7 +169,7 @@ inline bitcount_t trailingzeros(uint64_t v)
 #if defined(_M_X64) || defined(_M_ARM) || defined(_M_ARM64)
     unsigned long i;
     _BitScanForward64(&i, v);
-    return i;
+    return static_cast<bitcount_t>(i);
 #else
     // 32-bit x86
     uint32_t high = v >> 32;