diff --git a/src/stdlib/nums.c b/src/stdlib/nums.c
index 93e2b21..ca8dcc4 100644
--- a/src/stdlib/nums.c
+++ b/src/stdlib/nums.c
@@ -125,11 +125,11 @@ public CONSTFUNC bool Num32$near(float a, float b, float ratio, float absolute)
 
     if (a == b) return true;
 
-    float diff = fabs(a - b);
+    float diff = fabsf(a - b);
     if (diff < absolute) return true;
     else if (isnan(diff)) return false;
 
-    float epsilon = fabs(a * ratio) + fabs(b * ratio);
+    float epsilon = fabsf(a * ratio) + fabsf(b * ratio);
     if (isinf(epsilon)) epsilon = FLT_MAX;
     return (diff < epsilon);
 }
diff --git a/src/stdlib/nums.h b/src/stdlib/nums.h
index f355fb6..3f0cccc 100644
--- a/src/stdlib/nums.h
+++ b/src/stdlib/nums.h
@@ -100,7 +100,7 @@ MACROLIKE CONSTFUNC float Num32$from_int(Int_t i, bool truncate) {
         float ret = (float)mpz_get_d(*i.big);
         if (!truncate) {
             mpz_t roundtrip;
-            mpz_init_set_d(roundtrip, ret);
+            mpz_init_set_d(roundtrip, (double)ret);
             if unlikely (mpz_cmp(*i.big, roundtrip) != 0)
                 fail("Could not convert integer to 32-bit floating point without losing precision: ", i);
         }
diff --git a/src/stdlib/optionals.c b/src/stdlib/optionals.c
index d91ebff..462b2df 100644
--- a/src/stdlib/optionals.c
+++ b/src/stdlib/optionals.c
@@ -81,9 +81,9 @@ public void Optional$deserialize(FILE *in, void *outval, Array_t *pointers, cons
         else if (nonnull->tag == TableInfo)
             *(Table_t*)outval = (Table_t){.entries={.length=-1}};
         else if (nonnull == &Num$info)
-            *(double*)outval = NAN;
+            *(double*)outval = (double)NAN;
         else if (nonnull == &Num32$info)
-            *(float*)outval = NAN;
+            *(float*)outval = (float)NAN;
         else if (nonnull->tag == StructInfo || (nonnull->tag == OpaqueInfo && type->size > nonnull->size))
             memset(outval + type->size, -1, (size_t)(type->size - nonnull->size));
         else