diff --git a/src/arm/decoder.c b/src/arm/decoder.c
index 8fef6b18f..e75023ba1 100644
--- a/src/arm/decoder.c
+++ b/src/arm/decoder.c
@@ -190,6 +190,9 @@ static int _decodeMemory(struct ARMMemoryAccess memory, struct ARMCore* cpu, con
 				case 4:
 					value = cpu->memory.load32(cpu, addrBase, NULL);
 					break;
+				default:
+					// Should never be reached
+					abort();
 				}
 				const char* label = NULL;
 				if (symbols) {
diff --git a/src/core/core.c b/src/core/core.c
index 0879f9254..931b7feda 100644
--- a/src/core/core.c
+++ b/src/core/core.c
@@ -357,6 +357,8 @@ bool mCoreTakeScreenshotVF(struct mCore* core, struct VFile* vf) {
 	PNGWriteClose(png, info);
 	return success;
 #else
+	UNUSED(core);
+	UNUSED(vf);
 	return false;
 #endif
 }
diff --git a/src/debugger/parser.c b/src/debugger/parser.c
index 72eae1ed3..4af61a14e 100644
--- a/src/debugger/parser.c
+++ b/src/debugger/parser.c
@@ -782,7 +782,8 @@ bool mDebuggerEvaluateParseTree(struct mDebugger* debugger, struct ParseTree* tr
 	struct IntList stack;
 	int nextBranch;
 	bool ok = true;
-	int32_t tmpVal, tmpSegment;
+	int32_t tmpVal = 0;
+	int32_t tmpSegment = -1;
 
 	IntListInit(&stack, 0);
 	while (ok) {
diff --git a/src/gba/gba.c b/src/gba/gba.c
index de79671c5..cee833c5b 100644
--- a/src/gba/gba.c
+++ b/src/gba/gba.c
@@ -583,6 +583,10 @@ void GBADebug(struct GBA* gba, uint16_t flags) {
 }
 
 bool GBAIsROM(struct VFile* vf) {
+	if (!vf) {
+		return false;
+	}
+
 #ifdef USE_ELF
 	struct ELF* elf = ELFOpen(vf);
 	if (elf) {
@@ -594,9 +598,6 @@ bool GBAIsROM(struct VFile* vf) {
 		return isGBA;
 	}
 #endif
-	if (!vf) {
-		return false;
-	}
 
 	uint8_t signature[sizeof(GBA_ROM_MAGIC) + sizeof(GBA_ROM_MAGIC2)];
 	if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
diff --git a/src/script/context.c b/src/script/context.c
index ad4e445fc..84847983c 100644
--- a/src/script/context.c
+++ b/src/script/context.c
@@ -295,7 +295,7 @@ void mScriptContextExportNamespace(struct mScriptContext* context, const char* n
 }
 
 void mScriptContextSetDocstring(struct mScriptContext* context, const char* key, const char* docstring) {
-	HashTableInsert(&context->docstrings, key, docstring);
+	HashTableInsert(&context->docstrings, key, (char*) docstring);
 }
 
 const char* mScriptContextGetDocstring(struct mScriptContext* context, const char* key) {
diff --git a/src/sm83/decoder.c b/src/sm83/decoder.c
index 1240d5841..819576c26 100644
--- a/src/sm83/decoder.c
+++ b/src/sm83/decoder.c
@@ -413,6 +413,9 @@ size_t SM83Decode(uint8_t opcode, struct SM83InstructionInfo* info) {
 			info->op1.immediate |= opcode << ((info->opcodeSize - 2) * 8);
 		}
 		return 0;
+	default:
+		// Should never be reached
+		abort();
 	}
 	++info->opcodeSize;
 	return decoder(opcode, info);