diff --git a/include/core/SkPostConfig.h b/include/core/SkPostConfig.h
index cbfe9b1..9a5c54a 100644
--- a/include/core/SkPostConfig.h
+++ b/include/core/SkPostConfig.h
@@ -30,6 +30,12 @@
     #define SK_SCALAR_IS_FLOAT
 #endif
 
+#if defined(SK_MSCALAR_IS_DOUBLE) && defined(SK_MSCALAR_IS_FLOAT)
+    #error "cannot define both SK_MSCALAR_IS_DOUBLE and SK_MSCALAR_IS_FLOAT"
+#elif !defined(SK_MSCALAR_IS_DOUBLE) && !defined(SK_MSCALAR_IS_FLOAT)
+    #define SK_MSCALAR_IS_FLOAT
+#endif
+
 #if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN)
     #error "cannot define both SK_CPU_LENDIAN and SK_CPU_BENDIAN"
 #elif !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN)
diff --git a/include/utils/SkMatrix44.h b/include/utils/SkMatrix44.h
index 8c6d035..97faf78 100644
--- a/include/utils/SkMatrix44.h
+++ b/include/utils/SkMatrix44.h
@@ -29,7 +29,7 @@
         return x;
     }
     static const SkMScalar SK_MScalarPI = 3.141592653589793;
-#else
+#elif defined SK_MSCALAR_IS_FLOAT
     typedef float SkMScalar;
     static inline float SkFloatToMScalar(float x) {
         return x;
@@ -202,7 +202,7 @@
 
 #ifdef SK_MSCALAR_IS_DOUBLE
     void mapMScalars(const SkMScalar src[4], SkMScalar dst[4]) const;
-#else
+#elif defined SK_MSCALAR_IS_FLOAT
     void mapMScalars(const SkMScalar src[4], SkMScalar dst[4]) const {
         this->mapScalars(src, dst);
     }
diff --git a/src/utils/SkMatrix44.cpp b/src/utils/SkMatrix44.cpp
index 4fe82de..abef0b3 100644
--- a/src/utils/SkMatrix44.cpp
+++ b/src/utils/SkMatrix44.cpp
@@ -42,7 +42,7 @@
     for (int i = 0; i < 16; ++i) {
         dst[i] = SkMScalarToFloat(src[i]);
     }
-#else
+#elif defined SK_MSCALAR_IS_FLOAT
     memcpy(dst, src, 16 * sizeof(float));
 #endif
 }
@@ -51,7 +51,7 @@
     const SkMScalar* src = &fMat[0][0];
 #ifdef SK_MSCALAR_IS_DOUBLE
     memcpy(dst, src, 16 * sizeof(double));
-#else
+#elif defined SK_MSCALAR_IS_FLOAT
     for (int i = 0; i < 16; ++i) {
         dst[i] = SkMScalarToDouble(src[i]);
     }