diff --git a/cbits/rdrand.c b/cbits/rdrand.c
--- a/cbits/rdrand.c
+++ b/cbits/rdrand.c
@@ -13,7 +13,7 @@
 
 #ifdef arch_x86_64
 // Returns 1 on success
-inline int _rdrand64_step(uint64_t *therand)
+static inline int _rdrand64_step(uint64_t *therand)
 {
      unsigned char err;
      asm volatile("rdrand %0 ; setc %1"
@@ -56,7 +56,7 @@
 
 #ifdef arch_i386
 // Returns 1 on success
-inline int _rdrand32_step(uint32_t *therand)
+static inline int _rdrand32_step(uint32_t *therand)
 {
      unsigned char err;
      asm volatile("rdrand %0 ; setc %1"
diff --git a/entropy.cabal b/entropy.cabal
--- a/entropy.cabal
+++ b/entropy.cabal
@@ -1,5 +1,5 @@
 name:           entropy
-version:        0.3.6
+version:        0.3.7
 description:    A platform independent method to obtain cryptographically strong entropy
                 (RDRAND when available anywhere, urandom on nix, CryptAPI on Windows, patches welcome)
                 Users looking for cryptographically strong (number-theoretically
@@ -49,13 +49,13 @@
     cc-options:  -DXEN -DHAVE_RDRAND
   if arch(x86_64)
     cpp-options: -Darch_x86_64
-    cc-options:  -Darch_x86_64
+    cc-options:  -Darch_x86_64 -O2
     -- gcc 4.8.2 on i386 fails to compile rdrand.c when using -fPIC!
     c-sources:    cbits/rdrand.c
     include-dirs: cbits
   if arch(i386)
     cpp-options: -Darch_i386
-    cc-options:  -Darch_i386
+    cc-options:  -Darch_i386 -O2
   if os(windows)
     cpp-options: -DisWindows
     cc-options:  -DisWindows