diff --git a/src/compiler/Compiler.cpp b/src/compiler/Compiler.cpp
index 37b5ab2..90065a6 100644
--- a/src/compiler/Compiler.cpp
+++ b/src/compiler/Compiler.cpp
@@ -241,6 +241,11 @@
     floatingPoint.secondarySize = 1;
     floatingPoint.array = false;
 
+    TPublicType sampler;
+    sampler.primarySize = 1;
+    sampler.secondarySize = 1;
+    sampler.array = false;
+
     switch(shaderType)
     {
       case SH_FRAGMENT_SHADER:
@@ -252,6 +257,13 @@
         break;
       default: assert(false && "Language not supported");
     }
+    // We set defaults for all the sampler types, even those that are
+    // only available if an extension exists.
+    for (int samplerType = EbtGuardSamplerBegin + 1;
+         samplerType < EbtGuardSamplerEnd; ++samplerType) {
+        sampler.type = static_cast<TBasicType>(samplerType);
+        symbolTable.setDefaultPrecision(sampler, EbpLow);
+    }
 
     InsertBuiltInFunctions(shaderType, shaderSpec, resources, symbolTable);