diff --git a/src/LinearMath/btMatrix3x3.h b/src/LinearMath/btMatrix3x3.h
index 8297d5eb2..14fe704f8 100644
--- a/src/LinearMath/btMatrix3x3.h
+++ b/src/LinearMath/btMatrix3x3.h
@@ -367,7 +367,7 @@ public:
         vm[2] = v2;
 #elif defined(BT_USE_NEON)
         // note: zeros the w channel. We can preserve it at the cost of two more vtrn instructions.
-        static const uint32x2_t zMask = (const uint32x2_t) {-1, 0 };
+        static const uint32x2_t zMask = (const uint32x2_t) {static_cast<uint32_t>(-1), 0 };
         float32x4_t *vm = (float32x4_t *)m;
         float32x4x2_t top = vtrnq_f32( m_el[0].mVec128, m_el[1].mVec128 );  // {x0 x1 z0 z1}, {y0 y1 w0 w1}
         float32x2x2_t bl = vtrn_f32( vget_low_f32(m_el[2].mVec128), vdup_n_f32(0.0f) );       // {x2  0 }, {y2 0}
@@ -998,7 +998,7 @@ btMatrix3x3::transpose() const
     return btMatrix3x3( v0, v1, v2 );
 #elif defined(BT_USE_NEON)
     // note: zeros the w channel. We can preserve it at the cost of two more vtrn instructions.
-    static const uint32x2_t zMask = (const uint32x2_t) {-1, 0 };
+    static const uint32x2_t zMask = (const uint32x2_t) {static_cast<uint32_t>(-1), 0 };
     float32x4x2_t top = vtrnq_f32( m_el[0].mVec128, m_el[1].mVec128 );  // {x0 x1 z0 z1}, {y0 y1 w0 w1}
     float32x2x2_t bl = vtrn_f32( vget_low_f32(m_el[2].mVec128), vdup_n_f32(0.0f) );       // {x2  0 }, {y2 0}
     float32x4_t v0 = vcombine_f32( vget_low_f32(top.val[0]), bl.val[0] );
@@ -1058,7 +1058,7 @@ btMatrix3x3::transposeTimes(const btMatrix3x3& m) const
 
 #elif defined BT_USE_NEON
     // zeros w
-    static const uint32x4_t xyzMask = (const uint32x4_t){ -1, -1, -1, 0 };
+    static const uint32x4_t xyzMask = (const uint32x4_t){ static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), 0 };
     float32x4_t m0 = (float32x4_t) vandq_u32( (uint32x4_t) m.getRow(0).mVec128, xyzMask );
     float32x4_t m1 = (float32x4_t) vandq_u32( (uint32x4_t) m.getRow(1).mVec128, xyzMask );
     float32x4_t m2 = (float32x4_t) vandq_u32( (uint32x4_t) m.getRow(2).mVec128, xyzMask );
diff --git a/src/LinearMath/btVector3.cpp b/src/LinearMath/btVector3.cpp
index cf27d61dc..eadcedce7 100644
--- a/src/LinearMath/btVector3.cpp
+++ b/src/LinearMath/btVector3.cpp
@@ -897,8 +897,8 @@ long _maxdot_large_v0( const float *vv, const float *vec, unsigned long count, f
     float32x2_t dotMaxHi = (float32x2_t) { -BT_INFINITY, -BT_INFINITY };
     uint32x2_t indexLo = (uint32x2_t) {0, 1};
     uint32x2_t indexHi = (uint32x2_t) {2, 3};
-    uint32x2_t iLo = (uint32x2_t) {-1, -1};
-    uint32x2_t iHi = (uint32x2_t) {-1, -1};
+    uint32x2_t iLo = (uint32x2_t) {static_cast<uint32_t>(-1), static_cast<uint32_t>(-1)};
+    uint32x2_t iHi = (uint32x2_t) {static_cast<uint32_t>(-1), static_cast<uint32_t>(-1)};
     const uint32x2_t four = (uint32x2_t) {4,4};
 
     for( ; i+8 <= count; i+= 8 )
@@ -1084,7 +1084,7 @@ long _maxdot_large_v1( const float *vv, const float *vec, unsigned long count, f
     float32x4_t vHi = vdupq_lane_f32(vget_high_f32(vvec), 0);
     const uint32x4_t four = (uint32x4_t){ 4, 4, 4, 4 };
     uint32x4_t local_index = (uint32x4_t) {0, 1, 2, 3};
-    uint32x4_t index = (uint32x4_t) { -1, -1, -1, -1 };
+    uint32x4_t index = (uint32x4_t) { static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1) };
     float32x4_t maxDot = (float32x4_t) { -BT_INFINITY, -BT_INFINITY, -BT_INFINITY, -BT_INFINITY };
     
     unsigned long i = 0;
@@ -1282,8 +1282,8 @@ long _mindot_large_v0( const float *vv, const float *vec, unsigned long count, f
     float32x2_t dotMinHi = (float32x2_t) { BT_INFINITY, BT_INFINITY };
     uint32x2_t indexLo = (uint32x2_t) {0, 1};
     uint32x2_t indexHi = (uint32x2_t) {2, 3};
-    uint32x2_t iLo = (uint32x2_t) {-1, -1};
-    uint32x2_t iHi = (uint32x2_t) {-1, -1};
+    uint32x2_t iLo = (uint32x2_t) {static_cast<uint32_t>(-1), static_cast<uint32_t>(-1)};
+    uint32x2_t iHi = (uint32x2_t) {static_cast<uint32_t>(-1), static_cast<uint32_t>(-1)};
     const uint32x2_t four = (uint32x2_t) {4,4};
     
     for( ; i+8 <= count; i+= 8 )
@@ -1467,7 +1467,7 @@ long _mindot_large_v1( const float *vv, const float *vec, unsigned long count, f
     float32x4_t vHi = vdupq_lane_f32(vget_high_f32(vvec), 0);
     const uint32x4_t four = (uint32x4_t){ 4, 4, 4, 4 };
     uint32x4_t local_index = (uint32x4_t) {0, 1, 2, 3};
-    uint32x4_t index = (uint32x4_t) { -1, -1, -1, -1 };
+    uint32x4_t index = (uint32x4_t) { static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1) };
     float32x4_t minDot = (float32x4_t) { BT_INFINITY, BT_INFINITY, BT_INFINITY, BT_INFINITY };
     
     unsigned long i = 0;
diff --git a/src/LinearMath/btVector3.h b/src/LinearMath/btVector3.h
index 90e7f0de6..896859292 100644
--- a/src/LinearMath/btVector3.h
+++ b/src/LinearMath/btVector3.h
@@ -69,7 +69,8 @@ subject to the following restrictions:
 #ifdef BT_USE_NEON
 
 const float32x4_t ATTRIBUTE_ALIGNED16(btvMzeroMask) = (float32x4_t){-0.0f, -0.0f, -0.0f, -0.0f};
-const int32x4_t ATTRIBUTE_ALIGNED16(btvFFF0Mask) = (int32x4_t){0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0x0};
+const int32x4_t ATTRIBUTE_ALIGNED16(btvFFF0Mask) = (int32x4_t){static_cast<int32_t>(0xFFFFFFFF),
+	static_cast<int32_t>(0xFFFFFFFF), static_cast<int32_t>(0xFFFFFFFF), 0x0};
 const int32x4_t ATTRIBUTE_ALIGNED16(btvAbsMask) = (int32x4_t){0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF};
 const int32x4_t ATTRIBUTE_ALIGNED16(btv3AbsMask) = (int32x4_t){0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x0};
 
@@ -731,7 +732,7 @@ public:
         return btVector3(r);
         
 #elif defined(BT_USE_NEON)
-        static const uint32x4_t xyzMask = (const uint32x4_t){ -1, -1, -1, 0 };
+        static const uint32x4_t xyzMask = (const uint32x4_t){ static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), static_cast<uint32_t>(-1), 0 };
         float32x4_t a0 = vmulq_f32( v0.mVec128, this->mVec128);
         float32x4_t a1 = vmulq_f32( v1.mVec128, this->mVec128);
         float32x4_t a2 = vmulq_f32( v2.mVec128, this->mVec128);